Quote Originally Posted by Maxion View Post
Probably so it won't lock up when he has to change targets a lot and it'll get on cooldown.
Especially if he uses focus based targeting instead of having the dps target the mobs (in which case the reset=target won't happen anyway).
If your dps macros are /cast [@focus] or /cast[@focustarget] and the focus changes or your focus changes targets the reset=target fires

Because really you are getting the UnitID of whatever unit and when that number changes it fires the reset target.