At work I'm 100% doer,in my free time I'll split 40/60 depending on the situation or task or...
In general, I think both. I get easily drawn into both. Depends if I'm in need of entertainment or progress more at the moment I guess, and if I have the energy to fuck with it.
If you mean spontaneously, in a dangerous/urgent/vital situation I'd like to think doer, if I'm in a position to feel like I can do anything about it. Other than saving my sister from a pool when she saw a bug and freaked out I don't know that this instinct has been put to the test much. If it were a dangerous position to put myself in for a stranger it would probably depend on if I thought I would be any less helpless than they are. If they werent doing something stupid to cause the calamity and seemed like an outmatched victim I'd like to think I would quickly do whatever I could.