Again, if you have a log of a blindness trap failing at full mastery that would be interesting. My experience is that if you hit a blindness trap, it will work 100% of the time. That was also verified to me by another player who just finished playing a trapper within the past few months.

As to shifters stuff, as I said to Skaya, after paying an air shifter I think they probably need attention. There should probably be a fail rate on flyto, because that is pretty out of hand. But it also is totally unrelated to this issue.