An interesting idea, but tp-killers would adapt, I think. You could just wait the 8 seconds, pretending to help, then stab them in the back.
minetarria if someones trying to escape thay would ender pearl and cant get hit for 8 seconds and have time to run more and eat food. I agree
Or, we could make a broadcast that goes off every 10 minutes that says: "Don't accept teleport requests from strangers. STRANGER DANGER!"