Maybe it was just the tone of the bell resonanted in Targ brains sending them crazy. It would make just as much sense as anything else for people looking for some.
I do get the complaints about how it has been handled this season, but as you say and I was arguing in the early hours this morning, she was clearly always going this way. Perhaps it's why I enjoyed the spectacle and shock of how it happened way more, because I fully expected it.
Especially when Tyrion mentioned the bells for the 100th time in 5 mins