There is a loose block on Firefly (E3 5c) on Fly Wall. It is above the upper break after the hard moves on the crack on the second pitch. It is obviously drooping and ready to go. The block above and the one to the right are not beyond suspicion either. I'm afraid I was reluctant to go near it as my last encounter with loose rock on Fly Wall didn't end well. It would need or I would need a long screwdriver or similar that could could be wielded at arms length to pry it out. I'll have a go next time I'm there but not sure when that will be. In my view I don't think it is feasible or sensible to consider climbing the route thinking you'll be able to climb round it.