Geez, those Summer Sisters look almost as scary as the Brow does.
And yeah, that's some pretty terrifying villainy. You'd think the Brow would at least have the tiny amount of decency it would take to give them enough time to complete their errand that there's actually a possibility of coming back without finding that your sister has been perforated.
Also, speaking as a guy who actually did have his wrist broken once, I found the girls' quick recovery from that kind of annoying. Took me six weeks before my wrist healed, and for the first week after it broke, I couldn't even pick up a plastic comb with that hand.:/