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The more I get into WoD, the more I'm Jesse to my friend's Walt
(ttrpg.network)
Granted, Entropy 4 can just give someone a disease, so Jesse is overcomplicating the matter and I really don't think this oculd be anything but Vulgar Magic, but....
The real way is you pull it off after a melee has attacked the thing with something.
But crazy catapult shenanigans is more fun. Also, the 2nd method to get them bleeding. with the acid vials is absolutely RAW. 1.Free action to place a vial, or bundle of vials on the ground.
2. Use catapult on it. 3. Catapult does damage to the thing it hits and to the thing doing the hitting, which destroys the vial(s), releasing the acid for that damage.