Because Johnson. He was aware people were en route and closed the vote.
Its also misleading, its "some of the 11". Pelosi was in CA for a veterans day event, another was going in for a medical procedure, another had an unrelated (and unspecified) personal emergency, like 4 said they were stuck in traffic (motorcade blocking traffic), and I think it was 2 at the AIPAC event.
Not excusing anything here BTW, just pointing out the title is kinda shitty.