AWESOME ENDING!!!

Yeah it's pretty good. Similar to the ending of "The Mechanic".

But the reason it's good is because he incorporates his working skills into the crime story so it's kind of cyclic.

Cool.

Solves a long-standing dilemma for on-screen revenge.

Because you want to maintain suspense by keeping how — or even if the bad guy gets his — a surprise, he only knows he’s going to die for a split second. That’s the time between when our hero is revealed to have him ready to kill and the villain knows. That’s too short to be satisfying, so filmmakers try to lengthen it various ways, none very realistic. Usually involves the hero pointing a gun on the villain in some remote warehouse, regaling how he trapped him and how stupid he was to fall for it, etc. Standard stuff with no real tension, plus we know the villain expects to somehow talk him out of it or escape.

No, what the audience wants is to see the villain securely locked in while seconds count down, facing certain violent death. An execution, set for a few seconds from now with no chance of a reprieve. A little pomp and ceremony for the audience to enjoy of the trapped animal’s last moves and cries of desperation followed by BOOM.

Not realistic at all, but cinematically perfect.
After nearly two hours of this psycho creep, the audience needs it.