AITAH for Wanting 50% of Someone's Income, to Drive Them to the Hospital?

Last night I came across a guy, who had been mugged, stabbed, and was bleeding out. He desperately needed me to drive him to the hospital.

First I said: “Well, you shouldn’t have started it, when you allowed yourself to be attacked!”

Secondly, I said I could help him if he promised me 50% of his income, for the rest of his life. And then, for some reason, he got mad??

I said to him: “You don’t have any cards here.” And I told him that keeping 50% his income is better than the 0% he’ll get if he dies…

Am I the asshole, just because I wouldn’t help someone innocent in need, unless there’s something in it for me? Should I be punished, just because I had the means to help, with a car and all the time in the world?

(On a completely unrelated note: Slava Ukraini! ✊🏻🇺🇦)