Guild Wars 2

I arrived at the golem mark II Pre-event earlier tonight, the one where you get 15 minutes to disable some toxic materials while fighting off the asura inquest guys.
I got there pretty early, with maybe 10-11 minutes left in the event, and someone who arrived before me had run around and trolled the event by activating all the cannisters I guess they’re called and not defending them from the inquest.
So with 10 minutes left in event, nobody who showed up could do anything but wait for the timer to tick down to fail since the cannisters can I guess only be activated once per event.
So I guess my suggestion would be to have the cannisters of toxins be able to be activated/defended more than once per event to avoid people simply running around and activating them all at once to ruin the event.