The first mythic encounter in Nathria is Shriekwing, and before tonight we had already had some time to wipe on this boss. Our main issue was phase two, where we kept coating the floor in blood instead of keeping it tidy. A few times we did well in the first 2nd phase, and then messed up royally in the second. Tonight we finally sorted ourselves out! Shriekwing is dead, more mythic bosses to come!