When my female friends get hit on, should I do anything?

Its not uncommon my female friends get hit on when we're all out at the bars. So far my friends have just been friendly and talked to the guys maybe longer than they would have wanted.

Should I walk up to make sure she's ok or just keep an eye on them in case they're a creep? I don't want to come off as overbearing or interrupt if she's actually interested. But I also have trouble telling if they're being friendly or actually enjoy the conversation

When my female friends get hit on, should I do anything?
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