You lower your head and make a sprint to the elevator which opens up just as you leap into it. Jack moves out of your way when you do this and then follows you into the elevator.

"Wow Wolf, you just missed getting nailed in the head." Jack says pressing the button up. He might be invisible, but you can tell by the movement of his clothing that he's fidgeting a lot. The building is shaking, not to mention the elevator, from Mr. Hyde's destructive rampage, you seriously hope it makes it to the top.

As the elevator ascends upward, you both can hear Mr. Hyde below bashing the elevator door open.

"YOU WON'T ESCAPE ME WOLF!" you can hear him yell. He's definitely in the shaft at this point, you can hear scraping and the twisting of metal. It sounds like he's climbing after you through the shaft, not the emergency ladder!

Suddenly the elevator creaks to a halt. Jack frantically presses the buttons, but nothing works.

"NO! Shit! No! This can't be happening! He must've knocked some sort of power out some how! Wolf there's a service panel up top, open it up and we'll escape out that way."

You punch out Jack

You remember an old saying, "A liar is still a liar even when he's telling the truth." And despite Jack telling you the truth about Henry, you can tell he still had his own agenda. In fact it's obvious he was trying to leave you here to rot.

"Hey Jack what's that?" you say pointing in his direction
"Huh?" Jack replies looking down and around himself.

POW!

You clock Jack in his bandaged face, cracking his sunglasses and knocking him to the floor. You quickly rummage through his coat and find a pistol and check the clip.

"Well, well, silver bullets. I always knew you weren't to be trusted! Hell, you sold out Henry pretty quickly. You were using me as a test subject for your formula and were probably were hoping me and Henry would end up killing each other. I knew I wasn't being an asshole to you for all these years for no reason! I bet this is the money I was never going to receive either right?" you open the briefcase and close it when you see it contains the money.
"Alright fine Wolf you got me, but what use is there in really killing me? You can have the money, you can escape. Just let me live, besides you owe me a life! Self serving it may have been; if it wasn't for my formula, you wouldn't have survived the arena!"

You better make up your mind either way; you can hear Mr. Hyde climbing closer to your location.

You kill Jack

"Fuck you Jack, I would've survived the arena even without your wonder drug, now how about I make myself invisible too?" and with those words you take off Jack's cracked sun glasses and shove two claws in where his eyes would be located, you know you got the right spot since you can feel the squish of the ocular jelly and his screams of agony.

While you'd normally finish the job you don't have time since you hear Mr. Hyde bounding on the bottom of the elevator, making dents in it. You grab the gun and the briefcase and leap up through the service panel in the roof, leaving Jack to writhe in unbelievable pain. Still hearing Mr. Hyde trying to get in, you leap to the emergency ladder, you're having difficulty holding on to the ladder, the gun AND the briefcase though, and guess which one you accidently drop?

The briefcase of course.

"Goddammit!" you shout as it tumbles from you. "Well someone's paying for that!"

You point the gun at the main elevator cable and fire, hitting it a couple times. It dangles a bit and then falls onto Mr. Hyde who is in no position to be able to stop it. Eventually the elevator hits the bottom of the shaft with Jack's dying body inside and crushing Mr. Hyde under it.

You continue your escape by prying the elevator doors open and crawl through panting heavily. You lie face up on the ground for awhile just resting. You think the effects of the formula are wearing off. Too bad, you liked feeling "young" again. You're also pissed that you dropped the damn briefcase of money. You'd climb down and get it, but you're honestly too damn tired and can't be bothered. You're starting to really feel the pain from all the physical activity you've been doing today.

"Damn, I really am getting too old for this shit." You say to yourself.