Stopping all on screen movement until event is processed

[FoxDemonSoavi]

If it is feasibly easy I would like help with this. If it is too hard I do not want to waste your time.

This is what I want to do:
1 - Let us say 5 people are running around the screen looking for you.
2 - You talk to one and all the others stop moving until you are done with the event generated by the one you are currently talking to.