Disclaimer: I really don't own anything.
Goku was now bored and didn't know what to do. So, he went to the Emiya house dojo to train. Shirou who was also there ask Goku to train him. Goku was eager to train somebody but Shirou would soon regret it. The training regimen that Goku has planned was insane that even made Saber take pity on Shirou. But he wasn't just going to give up. He trains and because of that he became even faster and stronger. What he didn't know that Goku was training him how to control his body's Ki. All he knew that he was getting stronger. Saber also almost realize this but because she didn't know the concept of Ki, she brushes it away.
A few days past. Shirou was at school. He hasn't seen Rin for a long time. " What was she doing know?" he thought. "Well if I know Rin, she must be preparing for something." he thought to himself. Later that day he felt something weird. Shinji has just met him and told him that something fun was going to happen. He really didn't take it seriously but know strange thing is beginning to happen. He can smell there is magic in the air. At night he began to investigate it. It was a life draining spell that Rin had told him about. "Why is it here again" thought Shirou. Soon Shinji came out from the shadows and greets Shirou. "Well you find it again. Why can't you just leave it Shirou? We can be better friends or also partners." . "No way I'm going to leave it" said Shirou angrily.
Shirou then manifest Kanchou and Byakuya in his hands and went to attack Shinji. But Shinji didn't even looked scared. Just when he was going to hit Shinji, Rider came out and block his sword with her dagger. Shirou afraid ran to the forest to summon Saber but Rider was too fast and she followed him not giving him a chance. Just when she was going to hit Shirou, Shirou uses his command spell to summon Saber instantly. Saber manage to block Rider daggers just in time. Rider than continue to attack but Saber manage to block and even counter the attack. Rider feeling out matched in close combat takes some distance from Saber. She uses her daggers that was connected to a chain to attack Saber from a distance away, this causing it harder for Saber to hit her. Saber then recklessly went after her avoiding attacks that could really be lethal.
During that time, Shirou uses this chance to go to Shinji. Shinji was so afraid that he ran as soon as he sees Shirou. But unfortunately for him, because he can now uses magic and the training from Goku make him faster than ever. Shinji also uses his weak magic against Shirou but it had no effect on him. He ran but Shirou still manage to catch up to him. Because he was afraid he told Shirou everything. About Sakura, how he get Rider and about his grandfather. Shirou feels mad and really angry about this. How come Sakura never told him about this he wonder. He beat Shinji a but and told him to give Sakura Rider back. Shinji obliged. They both went to meet Saber and Rider that was fighting.
Back with Saber and Rider. The fight was still going on strong. Saber who manage to close in the distance uses her sword fighting technique to fight Rider. But Rider makes up for this with her superior agility. The fight was a stalemate. But it was still leaning in Saber. She can counter everyones of Rider attacks but Rider could only barely dodge Saber's attack. When Shinji and Shirou arrived, just when Shirou ask both servant to stop Shinji not wanting to lose told Rider to use her Noble Phantasm. She uses her Noble Phantasm eventhough Shirou screams not to. Because of that Saber also have to use her Noble Phantasm.
A white horse with wings was summoned by Rider. It was Pegasus. Rider rode it and went into a dive to attack Saber. The attack looked like a shooting star falling. Saber also used her Noble Phantasm. She unsheathe her Sword from the winds that was making it invisible. The next word that came was the name of the sword and also the name of the attack. "Excalibur !" shouted Saber. The attacks was so powerful that the shockwave for the clash blew Shinji and Shirou a couple of meters away. The Excalibur blast was overpowering Pegasus but Shirou yelled "Don't kill he Saber". Saber heard this and proceed to power down her attack a little. The clash became a tie. When they both stop. Shirou hit Shinji again and make him give Rider back to Sakura. A couple of people notice the clash of the attack. One was Gilgamesh, Caster, Kirei and Goku who was there hiding watching everything plays out. Once done he IT'ed out of there.
If you wonder where have Goku been and why doesn't Lancer notice the clash of power, it was because Goku was fighting with Rider. Some moments ago when the clash of Noble Phantasm hasn't started yet, Goku when and searched for Rider. He can sense Rider near the park. He then teleported there with his Instant Transmission. He flew up in the sky so no one can notice him. He can see Taiga there on her way back home. Then Rider shows up and went to attack Taiga. Goku uses his super speed to block the incoming attack and saves Taiga. Taiga didn't see anything that happen because she has fainted. Goku saves her and put her far away from them on a bench.
"Wait you are the one from the other day with Saber and that boy" Lancer said surprised by this. "How can you be so fast? Wait are you also a sevant?" questioned Lancer. "Then you got everybody fooled. Wow how do you do that? You must either be really weak or strong." said Lancer. Lancer asked the last question "What class are you?". Goku answered "I'm a Berserker", "Then you must be strong. Lets have a good fight" said Lancer while preparing to attack. Goku used his super speed to move. Just when Lancer was about to attack, he was hit in the gut and went flying up in the sky. Goku also fly there and uses a few air combo and finally kicking him to the ground. Lancer coughed up blood and felt weak. Just when he was about to get up, Goku from the sky fire some Ki blast at Lancer. It hit Lancer and he flew away some few more meters. This time Lancer quickly gets up and wanted to use his Noble Phantasm Gae bolg to attack but Goku wouldn't even give him a chance. Goku hit Lancer in the stomach the kick him from the right then from the left and then uppercut him in the jaw. He uses his super speed to go at Lancer's back and knee him on the back of his head. He uses his super speed again and went infront and elbow Lancer in the chest making him fly into the trees breaking it. Lancer was now really weak and can't even get up. Goku who wanted to finish this war fast uses Destructo disc and threw it at Lancer which cut him in half. All of this happens so fast that not even Kirei gets to see what happen. "Well you are really strong but are you really Berseker you seem to think fairly straight and not all crazy?" said Lancer. " Or maybe you haven't even use your Bersekers power. Wow you really are strong." Lancer continued. He then vanished into light.
Just then Goku sensed the clash of energy and IT'ed there. Gilgamesh sense that there is one more servant that has vanished from this world. He also sensed the clash of power that happened. "Well another mongrel bites the dust and my favourite Saber is fighting somebody" Gilgamesh said all arrogantly. " I wonder who killed the mongrel but doesn't matter, I should really visit Saber sometime" said Gilgamesh. Caster also sensed the clash and also wonder who did it. Kirei can see the light and speculate that something had happened. Goku who has just seen everything and saved Taiga went back to Emiya manor and rest thinking what would he do after this. He could always went yo the temple where he sensed two servants or he could go to the the stronger one with a higher Power level. Well he would think about it later as he went and slept.