Guys, what are some things you do when another guy is hitting on your crush?

Not a girlfriend but someone who you like but have no claim to. I'm curious because I noticed one of my guy friends kept positioning himself in between myself and a guy that was talking to me. Got me curious if he likes me and got me wondering what some guys do in this situation.
Guys, what are some things you do when another guy is hitting on your crush?
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