i can't even guess as to why they went quiet. not one guess at all. we will never know.
edit: well they're not quiet now once they get called out
Jill set and lit the bomb, and lifts up a big expensive sign saying that defusing bombs is antisemitic and what Putin wants. Bob tries as hard as he can to put out the bomb anyway, but Jill made sure to design it such that Bob can't defuse it. So, once it's clear his efforts are futile, Bob runs as fast as he can away from Jill and the bomb, and the bomb blows up.
When does it become Jill's fault that she did actively take harmful actions?