I think a person erasing their drawing thatโs you drew on is a clear sign of โYou should stopโ
But you kept on going and I even put can you stop?
People that draw on other drawings isnโt funny to me anymore itโs annoying.
You couldโve just asked if they wanted the help instead of drawing on their drawing and not saying anything.
Plus if the person didnโt like it you couldve stopped and let them do their thing.