He was investigating a warehouse due to hints about criminal activity going there, and what he didn't expect him to find was was Jason tied to a chair looking bloody and weak as joker taunted him cruelly, it's been 2 years since he last saw Jason and he felt his anger flare up..this was where he had been when everyone thought he died? Bruce told him he was gone..
He tried to control it but the more he heard jokers annoying voice the more it brought him closer to snapping..that's when he saw joker hitting Jason with a crowbar and all his control went out the window. How many times did that clown do that do him?!
He jumps in and grabs joker by the collar throwing him against the wall..he repeatedly punches the clown in the face till his face was unrecognizable and he didn't realize when the clown stopped breathing..he had continued to punch him.
He only stopped when he heard Jason's voice..he froze and looked around..
Batman was going to kill him.
He doesn't care about that for now, he runs over to Jason and pulls him up to a sitting position
"You okay Jay..? What did that clown do to you?" He was so concerned now.