User blog comment:Drayco90/Marvel vs. DC- Universes Collide Super Tournament/@comment-4098900-20130209004927

" SHIELD ‘s even investigated rumors in the past that he made some kind of deal with a demon in those jungles to become an ultimate killing machine just so the fighting would never have to end.”

That's a reference to the PunisherMAX Born mini series.

" I’m still dead, Frank.” She called to him, a mixture of anger and disapproval in her voice. “ WE are still dead Frank.”

They had that in PunisherMAX Volume. 4: Up is Down Black is White

"  All you can see is the little picture. You think you can win your war on crime? There’s always gonna be criminals, Castle. You can’t kill them all. That’s... why… I…” the former Robin punctuated each word with another stab. “…chose an alternative- control it instead.”

Red Hood said something like that to Batman in Under the Red Hood.