Disclaimer- If I owned Torchwood, Ianto would never have died, he would be immortal and Gwen wouldn't have joined.
Warning- Slightly gory, not graphic
Way 3
(During Everything Changes)
Jack was standing on the roof of the Millennium Centre, listening to the cars that drove past. He was right at the top, but, as no one else went up that high, he was standing right on the edge. He often went up to roofs to think, now he was contemplating this nosy PC, Gwen Cooper. Consequently he did not notice Ianto walking up behind him, not until Ianto politely coughed causing Jack to jump, foot slipping on the edge of the roof, and fall down. As his foot went off the edge, Ianto moved forwards, trying to help, but was not fast enough. Jack fell down, plummeting to the floor, as Ianto ran back down the stairs, all the time hoping to be faster than Jack. He reached the last step just as Jack hit the ground, spine breaking upon impact. Ianto sat down next to Jack, stroking his hair, even as the pool of blood around Jack got larger.
"No, no, Jack, you can't be dead! It's my fault, I'm sorry, I'm so, so sorry. I didn't mean to! I-" His words faltered mid word, his sobbing becoming too overwhelming. He was so absorbed in his grief, he almost missed a loud crack coming from Jack's dead body, followed by a loud gasp then low moan of pain, as the previously dead Jack woke up.
"OW! I hate falling off buildings, always hurts my back afterwards."
Ianto scrambled backwards, a look of horror and shock on his face as Jack stood up, stretching his back until it popped.
"Ho-How? How did you survive? You were DEAD!"
"Ah." Jack looked down at the still sitting Ianto. "Ummm… I can't die."
"How?"
"I'm immortal, something happened to me a while back, now I can't die, well, I can't stay dead for long."
"Ok, alright."
"You believe me?" Jack asked, surprised.
"Well, you did just fall off the Millennium Centre, break your spine, die then come back to life before my eyes, so yeah, I believe you."
Jack helped Ianto up. "Come on, let's get back to the Hub." Jack started walking back towards the Water Tower, not noticing Ianto pulling out his gun.
BANG
The gunshot echoed in the alleyway, Jack falling to the ground, a look of shock on his face and a clean bullet wound going from his back to chest, through his heart. Ianto checked if he was dead or not, then, after deciding he was dead, sat down next to Jack and waited for him to resurrect. Three minutes later, Jack gasped and jerked up, the gunshot wound healed. He pulled out his gun and levelled it at Ianto.
"WHY DID YOU SHOOT ME?" Jack shouted.
"I had to check, sir. I'm sorry I had to shoot you." Ianto looked him in the eyes, showing the truth in his apology and justification. Jack holstered his gun and pulled Ianto off the floor.
"I would appreciate it if you didn't do that again, Ianto."
"Of course, sir. I won't shoot you again." Ianto smirked "Unless it is absolutely necessary."
Jack smiled, "Let's hope you don't need to." They started walking back to the Hub, this time side by side.