Interrupt: start a conversation with the person engaging in the inappropriate behaviour to allow the potential target to move away or have friends intervene.

Or come up with an idea to get the person out of the situation – for example, say you need to speak to them or their friend is looking for them. Any excuse to get them away to safety.

Alternatively, try distracting or re-directing the situation.

If you feel too uncomfortable speaking out, or you don’t feel safe to do so, get someone else to step in.

Any decent venue will have a zero tolerance policy on harassment, so the staff there will act.

If the situation is too dangerous to challenge there and then, (such as there is the threat of physical violence or you are outnumbered), just walk away.

Wait for the situation to pass then ask the victim later if they are ok.

Or report it when it is safe to do so – it’s never too late to act.