Ever since the last balance patch, I have been noticing that occasionally in wvw when I use certain skills they do not go onto cd, but instead allow me to use them twice in a row. It happens quite randomly, sometimes 5 times within 20 minutes, sometimes only once per day. I main a Mesmer so that is the toon ive been noticing it on. But for my fellow mesmers out there, imagine you are using a pistol and are capable of chain summoning 2 phantasmal duelists in a row (this is the skill it happens on most frequently for me) Its game breaking.