During a Spooky Lost Sector mission for the event, the randoms missed the last pumpkin to throw to break the bosses shield, which caused us to be stuck with no timer or anyway to break the bosses shield, there's no wipe mechanic so our only option was to back out and restart a new run. This wasted pages and time. Not cool.
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If you run out of bombs they should start spawning at the tree where the chest spawns, after a little time.