A supposed thief is escaping down a narrow alleyway towards you, pursued by another person...

Don’t get involved; step out of the way.

Block the entrance so the other guy can catch up, but step aside if the thief tries to engage you.

Block the entrance, so the other guy can catch up, but defend yourself if the thief tries to engage you.

Actively engage the thief and try to beat them until they surrender.

Actively engage the thief and try to kill them.

A supposed thief is escaping down a narrow alleyway towards you, pursued by another person. What will you do?