原文You don't choose a target for Red Hulk's last ability at the time it triggers. Rather, a second "reflexive" ability triggers when you put a +1/+1 counter on him this way. You choose a target for that ability as it goes on the stack. Each player may respond to this triggered ability as normal.
原文Red Hulk must survive the damage in order to get the +1/+1 counter. If he's not on the battlefield when the last ability resolves, you won't put a +1/+1 counter on him and the reflexive triggered ability won't trigger at all.