The rescuers would have been stung by jellyfish
He could have left a huge sign on bathroom door
CAUTION - THERE ARE DEADLY JELLYFISH IN THE BATHTUB!!!
But no
Hopefully none of the rescuers would die, but it's not far-fetched that they'd get stung, and that immediate excrutiating pain would have definitely delayed the rescue, and had a horrible impact on the rescuers.
Way to go Ben/Tim. Harm some more people with your carelessness!