These funny situations happen to me all the time. I use a couple of standard pvp rules to decide whether I kill an enemy player or not. One of those rules is that I don't try to start a ganking war when I'm trying to complete some quests in an area. Which led to having my own alliance pet player following me around for about half an hour or so. This player was somehow so mesmerised that he constantly forgot that keep an eye on the patrolling mobs and he got himself into trouble (4 or more mobs at a time) several times. Him accidentally rounding up those mobs actually helped me finish my quests faster.