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Idles are always performed solo (with the exception of the goblin shaman); a second idle animation is only used for cutscenes.
The hit animation is a bit weak; if the unit is four squares in size, it works well – such a large creature won’t even notice the impact, but a single-square unit would look strange when a knight stabs it with a spear or a devil punches it.
In Heroes, only one unit has such an exaggerated hit animation – the Titan. Its size allows for it; it’s amusing that a stronger unit (the fire dragon) gets knocked back more – it has to step back with one leg when the Titan just sighs and barely moves.
Funny hit animation also belongs to the Cyclops; it feels the impact but waves it off as if it were a mosquito.