It's pretty important for a game I'm playing ATM. I would have assumed that the units are displaced from whatever unit is the main target in the direction from said unit, but observations seem to counter this.
What you described seems like the norm. What exactly did you see that counters it?
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Usually it works like that, but not always. The only example I can think of it the annihilator hitting a scout with another unit behind it. The scout went left(or right, can't remember) and the unit behind it when the opposite direction. I know the scout has that retreat ability but that itself can't explain it. There are other examples that I can recall where it's acted very weirdly, not including a scout.
Can't tell without a screenshot. If you remember the exact setup maybe you could recreate easily.
In most other cases we've seen, if a Scout is damaged by a unit with a knock/pull, it behaves like any other target. The only weird one is the Chieftain whirlwind where the Scout gets pushed and then pulled, almost always winding up in the same place (but the replay is buggy IIRC).
Nothing weird should happen with Annihilator though--AFAIK knocks Scout back one square unless the target square is full.
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