<-- This guy has a plan.
It involves turning into a Lightning Form and blowing everything up. It also makes the Powerpuffs look vastly underpowered.
New plan? Ask Monkey to lend a hand once he's done with the purple guy.
EDIT: I thought there was something about the direction in which Bell was looking that looked wrong. Now I know what it is: she's faced toward Mr. Beetle, or perhaps Sam (did she hear the insult Sam thought? If so, she should be able to hear Blossom's approach). Maybe Bell hasn't noticed Blossom yet, but she will assuming Gir speaks up when she passes him.
Also, Bell is bouncing stones off Mr. Beetle. She's bored!