i too am having this trouble with opening strike and Alpha strike , they never work together to give me 10 stacks of vulnerbility, at the very best ill get an opening strike of me but its so flakey .
i have put pet on gaurd and just hit mobs and some times it works some times not but more often than not it just doesnt work .
i have also just put my pet on attack and didnt hit target and yet again same effects as opening strike for me ,some times work s some times it doesnt ….. but it didnt trigger as often as my opening strike.
and it has NEVER EVER procced double bubble e.g i get opening strike and my pet gets alpha strike on the target its just never happened for me .
i have now personnally retrained and took no points in markmanship as whats the point of spending 15 points to get both opening and alpha strikes if at best they MIGHT work but NEVER work together ……………………..
just saying like