Ezra is all for getting out and doing stuff (which is partly the reason he would prefer to withdraw from the school, but Victor's "field trips" will suffice).

I THINK it didn't get done because Romania trip/bus attack/Lera!?, the latter causing everyone to freak the fuck out and worry about that versus further investigation. Technically not a lot of time has passed?

Splitting up (or saying they split up) might be the best idea- with Rhys and Ez being such keeners they could spearhead seperate excursions, one into the Tower and the other into the caves, at least for a short while. There are apparently a lot of caves to look out for.