Like I said, I am fairly sure something strange is going on with the RNG at the moment. Long strings of evade and whatnot should only happen once a blue moon.

Chance for night elf to evade 1 shot: 30%
Chance to evade twice in a row: 9%
3 times: 2.7%
4 times: .81%
5 times: .24%
10 times: .00059%

I know that strings of evades at least this long happen with fairly common frequency. I'll test this out whenever I get a chance.