Can't speak for Defile Defenses as I don't use it, but they will use Rigor Mortis "Intelligently". As in sort of.
In short, they won't tend to cast it on any enemy for no reason, they will cast it on an opponent that is blocking attacks...however it might not be an opponent that you are attacking. For example if you are against a group of Kournan Rangers, and each of them is being attacked by one minion, except one who is being attacked by all 4 Paragons on your team, the hero may opt to cast it on one of the ones being attacked by a minion instead instead of the one your 4 Paragons are throwing Spears at.
They might also cast it on an enemy who is at about 5% HP and is going to die from a single hit anyway in a sec regardless of thier blocking, wasting the skill as it has a reasonably long recharge.
But it does function well enough and if in doubt you can always micro it.
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