In the tutorial dungeon, the electric cloud asks you to throw something at it. If you chose the pot closest to the character [there's x2 pots, a barrel, a box] the item isn't heavy enough to shut the trap off
Weight isn't the issue. There is a bug in the beta with the point you need to drop the vase actually a little past the vent; crates and barrels work better because their surface area is large enough to generally hit the required area if aiming at the indicated area.
