You're pretty much looking for a way to take a peek in their head and be able to see the mob's hate list, and I'm almost positive that's something that is not transmitted to us via the client.
The best advice would be to know your spells and get a feel for the people you group with to see how fast they can generate agro and/or get it back if they lose it.
/shrug
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"Certainty of death! Small chance of success! What are we waiting for?!"
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