In the Wonderful World of Warcraft it's called ganking.
Unless you are on a sissy role playing realm, red = dead. Meaning, the guy from the other faction is fair game to attack (some restrictions do apply).
You might not gain anything from killing the lowby, but you can off him non the less.
(but considering the options it would be a major PITA to stalk a guy who can play around 50 different characters on a couple hundred different servers....)
Plus of course, once you revive, you have only half health, lost a few buffs....or you spirit res at the cost of 75% of your abilities, broken armor, etc....
An ambitious and possibly expensive proposition to sour the game play for the son this way though....