Anger or let it go?

If a girl pushes down a guy intentionally on a staircase... like there are almost 20 steps
How a guy should react?
->Guy liked that girl
->proposed her but she said no
->staircase thing happened 1.5 years after proposal.
->Guy is short tempered, but not for women.. he respects them

->he is nice guy
1 y
He is like 1000 times stronger than her... He was going upstairs... on the top step she suddenly came and pushed him down
Anger or let it go?
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