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Jack mistakenly believes that Natasha has killed Renee. He's pissed and wants revenge. So here is the tale of the tape:

Black Widow:
Former KGB Operative
Former S.H.I.E.L.D. Operator
Avengers Member

Jack Bauer:
Former Delta Force
ex-CIA Operative
ex-Counterterrorism Operative

Both are highly skilled and hyper lethal. Both know each others skill set. Who wins? To make it a fair fight, the Avengers cannot interfere. Each is equipped with a HK-42 handgun with 2 spare magazines and a combat knife.

https://youtu.be/Fq3BDO-63u4

Widow destroys him.