It's good to try to save someone from choking.
John is eating at a nearly empty restaurant when he notices the person at the table near him starts to flail and make gasping noises.
John needs to decide whether to ignore this strange behavior.
John gets up and checks on the person, noticing they're choking at he gets closer, and starts doing the Heimlich.
John looks back down at his meal, figuring the situation will sort itself out.
The other person eventually spits out the food that was lodged in their throat, and breathlessly thanks John.
The other person turns blue and slumps in their chair before a waiter notices.