Billee of Bloodscalp made a post reporting what he thought was a bug with Bloodlust/heroism:

“Bloodlust still gets removed if you use it when you are too close to a wall and cannot have your body made bigger by the buff. Im not sure if it removes it for the whole group if the caster is too close but i do know that it is removed if you are too close to a wall.

Im sure this is an unintended bug but it can be fairly game breaking to lose 750 mana on something that goes right away.”

To which Hortus replied

So it looks like when you pop Bloodlust/Heroism, make sure you and your groupmates are not standing right next to a wall. Kind of a dumb way to solve the problem, imo.