Protoss Mission 6 bugs

I’ve encountered a bug in the Protoss campaign, mission 6 when using the hallucination skill of Tassadar on Infested Terrans. Sometimes it happens that they explode to kill the hallucinations but stay alive. Right now I’ve had one infested terran that killed 3 hallucinations skill in a row. This can’t be right.

To repeat the bug, as far as I can tell, stay out of sight/reach of the Infested Terran and use the skill, it will not die, unless I walk towards him for him to notice my character.

Also I’ve encountered the bug where the Protoss Dragoon will be able to go down a set of stairs but is unable to go up.
I tried all three set of stairs.

I’ve never seen an Infested Terran explode but stay alive, against a Hallucination or anything else. If there is a bug, I doubt it’s exclusive to the campaigns since they work the same in custom games, although you don’t get to see them often to test things out.

As far as getting the Dragoon up the stairs, the trick is to stop in the middle and then start it moving again. It has to do with the way the movement works.