I sent a bug report about this in the last beta push, but it's still happening.

When you initially use infernal beam on a target, if there's mobs past the one you've targeted, they will be hit by it and pull in as well. It only happens on the first tick and they have to be directly in line with your target. Rare to happen but it does.

I'm posting it here so I can see if others have had it happen and because it hasn't been fixed yet.