I'm pretty sure casting speed doesn't work, tower capping doesn't count as casting a spell. Most people either confuse it with lag (sometimes tower cap alarm doesn't sound even when its being capped), or Holy Aura + Fearless, allowing them to still have fearless even after capping finishes, giving the appearence of a shorter cap time than 15 seconds.
it wasnt lag as all the ppl in our guild got the warning at the 8sec remaining mark (u can c the timer now in sw). even with holy aura + fearlessu still have less then 15 sec needed to capture a tower, also they will have to use it first to get to the tower (to avoid traps fearing them) and then that leave even less time to get the tower.
ok we will c if either the p/k skill or ancient spirit+ arcane potion work tonight