The reason for not trusting Tinman became very clear once you entered the forest. It was dark and spooky. The witch might very well be here, lurking behind the trees ready to jump out and attack. You grab Scarecrows hand, and to your surprise she grabs it back.
"So," you yell at Tinman, "This is the fastest way to the Witch's Castle?"
"Oh no!" he called back toward you. "The fastest way is to go through the open fields down the yellow brick road to the Wizard, then fork left to the Witch's Castle."
What! You mean all this time you could have followed the yellow brick road, like in the movie, and no one not Glenda, Scarecrow, or Tinman decided to tell you this until you got to the creepy forest! You feel the scream rise through your throat, "Then why are we not doing that?!"
Scarecrow beside you flinches, and Tinman spins around swinging his ax right above your head. You duck to keep your head from being cut off.
"Because," the harshness of the tone makes you flinch again. "The yellow brick road is not safe. Her monkeys are flying around all of Oz looking for a little girl in jeans who sticks out like a sore thumb. This is the fastest way to get to the witches castle and not be dead when you get there."
You nod, less because you follow the logic, and more because the ax is still right above your head. Satisfied, Tinman turns around and keeps walking. You begrudgingly stumble along behind him with Scarecrow at your side. She slips her hand into yours and gives it a squeeze, silently asking is you are okay. You nod your head answering yes, but you are really mad that your aunt is trying to kill you and your parents. You are also really mad that you still have no idea what the heck is going on, and Scarlet cannot tell you because she does not even realize that you knew before you fell through the portal. Now you realize you are Dorothy, "I want to go home," you think to yourself. To make matters worse the way home is not down a gold road to a magical city, but one of the creepiest roads you have ever been on to the women who is trying to kill you, but has spent a lifetime telling you that she loves you.
"Dori," Scarecrow said "What is wrong?"
"I just want to go home," you choke out.
That is when Tinman sarcastic tone rang in your ears. "Well, crying like a baby won't help you."
"Maybe I should take that ax of yours and stab you in the heart! OH WAIT! You don't HAVE ONE!" you scream at the top of your lungs.
You were ready for the ax this time, and you pulled Scarecrow down with you. Tinman sweeps the blade across where your necks were supposed to be, but you and Scarecrow are clear, barely. You can feel the wind whoosh over your necks.
"I d- do-nt ha- have a h- heart b- b- because it was st-st-stolen." Tinman pitifully sobbed.
The words you were going to reply die on your tongue, when you see the anguish in his eyes. You were going to ask how but then it dawned on you. The witch. That witch stole his heart. How can someone be that evil?
You hear a loud crunch behind you. You heart thuds loudly in your chest. The lion has found you guys! You are going to die! "The lion!" you think. The Lion needed courage from the Wizard, maybe he too scared to try to kill us!
You turn around and see nothing. You know that you heard a crunch, so you look down and see a little lion cub. "Oh No!" you think to yourself, "how in the world are we going to kill my aunt with Simba?!"
The cub looks at you with gleaming eyes. You wave him away and he crouches down like he is ready to attack you. "Go home!" you say to him. "Go home little boy!"
The lion cub starts to circle you and your friends. Scarecrow runs and hugs you, "D-D-Dori, wh-wh-what's that?"
"A lion cub, Scarecrow. It's okay, it won't hurt us," you say to her soothingly. Scarecrow nods, but then you feel the cold tin push your body forward.
A cold hand pushes you towards the cub. "Here you go little lion," Tinman taunts. You push back towards the hand, and the tin cuts into your flesh, drawing blood. "Here are some yummy flesh, little lion. You can't eat tin, tin can hurt you."
"Really!" You way looking back at him. "It's a little cub. What's it going to do?" You move to pet it. Suddenly, the lion cub starts making this weird sound out of its mouth, it's like it started as a cry then turned into a scream. He screamed like this for a good five minutes, then he got an answer. A big, loud answer that sounded angry and close.
Scarecrow answered your question. "C-C-Call his dad! Wh-Wh-What do we do?"
"RUN!" You all turned around from the little prince of the forest and started running the other way.