Agreed with the delayed trigger. I did find that chain reactions automatically trigger on arrows you shoot if you have one of the fields already detonated. I did like that, if it's intentional. It also goes off of the initial field too. The raw numbers for support are there, but the cooldowns, lack of survivability and group support boons will kill this.
Tried this in a WvW zerg and the amount of barrier this can pump out in one burst is disgustingly high, but relies on way too many variables and is so hard to get that down with the small radius and cooldowns chocking it up. It needs a LOT of work. And the fun factor is just non-existent
Group support boons are needed (Stab, Resistance, Prot)
Radius increase
Playstyle completely reworked. This isn't fun