Weird healing bug

[Enculator]

Here is the film :
http://salamisquad.free.fr/myth/healbug

It was on demise fr. The bug happens at 1 minute left, north of the map (pink herons).
1 of my heron want to heal his buddy heron. During the healing annimation (not the flashy bubbles on the healed unit but the annimation where herons raise their hands to heal) i think i clicked somewhere else.
There are the heal sound, the healing annimation and my heron used his root, and the wounded heron didnt get healed.

duno if it's a known bug or anything.

[Tireces]

Good he didnt explode hehehe

[Avatara]

This also happened to me a couple of times.

Also, I would like to ask if dummy targets dying when healed is intentional behavior or not.