Reports from fan battles.

When there are only a few hit points left, healing is always more useful than damage reduction. Damage reduction can be removed quickly, and they can finish off the tactic with any action. But mass cancel – that was my mistake. It also removed my Sorceresses, who were blocking the Gargantuan.

There was no one to remove hit points from your 10 hit points:) The Phoenix reliably removed all the hit points from the tactic, and the elementals only attacked after that, so there was probably no chance of taking down your tactic so quickly:) But in this case, in my opinion.
And in general, I'll remember the difference between healing and damage reduction:)