Bulbs are fly-based enemies added in The Binding of Isaac: Repentance. They fly in erratic, right-angled motions.
If Isaac has an active item with any amount of charges (this includes timed recharge items), they fly towards him and drain up to 2 charges upon contact, but do not deal damage. The more charges the current item has, the faster they are.
If Isaac does not have an active item, or if his item has no charges, they simply fly around randomly and are completely harmless.
Bulbs replace the Greed Gaper in treasure rooms.
Bloodflies are enemies added in The Binding of Isaac: Repentance. Exclusively encountered in Corpse, they behave very similarly to Bulbs in movement but unlike Bulbs, don't drain charges and deal contact damage.
Bloodflies are spawned by Pustules if they are not destroyed after reaching maximum size. Bloodflies chase Isaac, and, upon death, shoot 4 blood shots in the cardinal directions.
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