Seal area preparation is a nice addition however there are bugs with it (see my recent thread about it) when using DD on interupt traits and possibly On interupt runes or sigil etc.
The PI trait doesn't have an internal CD unless it's a defiance bar monster on other skills however when testing the usage possibilities against zerg fights in wvw with our trusty heartseeker spammers (and infamous Aikijinx) we came across some bugs.
Primarily that seal area, while it's activated, can still allow enemies to enter or exit if they push through or leap skills/charge skills...this is without stunbreaks, evades or stability mind you...its something to be addressed if it has any hope to stay in my skillbar...not to count for the fact that preparations can bug out and never activate anyway despite staying red in ready mode.
Then the awesome thing...seal area can prevent skill usage if someone using an unprotected (anti interupt buffs) skill and be interupted which does and should proc on-interupt traits, skills, runes and sigils...the issue is that despite the enemy getting inside sometimes with HS spam, it only allows 1 to 2 PI trigger from intrupting HSs.
Several times and several classes have been used and we even staged it where no one got inside...but it wont proc everytime an interupt is triggered
This needs to be addressed as a whole, not just one bug but rather both.
I would be happy to help people test it further in game. NA only