tried looking for this in card discussion but could not find it..

Question:
why sometimes after i coercion an ally, it is disabled (darkened) but if i coerce a soothjaw, it could still attack me the next turn
are there any other ally that are like soothjaw?

also apparently i could not coerce an 4/4 armor that become an ally?
how does coercion works with other artifact such totem or clockwork soldier?