No the reflective shell didn't trigger on these arrows. (It certainly did work on other attacks, which largely explains the pittyful state of Lae'zel and Minthara in the screenshots above)
The effect started suddenly and ended several rounds later.
What I do have from time to time is a delay between a swing or shot, and a hit. Up to several seconds sometimes. But never before did I have attacks just "disappearing" completely .
Not something you need in a terrible battle like this one.
