I'm a sentinel player in immortal and I realized the thing that counters my setups the most are breach players on sites like A Haven, A Split, etc. Where you are supposed to anchor and try to get a numerical advantage for the retake, but breach stuns and flashes just absolutely own me. Off angles are bad against flashes, normal hold positions are bad against stuns, it's like the perfect counter.

Also for the life of me I can't dodge flashes, I don't know if my sense is just too low or what, but I'm just prey for any good pheonix yoru or breach. Skye flashes are easier cause they make noise but that's about it.