Yes. For that reason, I personally don't like to slot it. The extra resistance debuff is good, but I prefer to know consistently if the enemies will aggro or not - since you can't know for *sure* that it won't aggro, you can't really take advantage of the 80% of the time it doesn't, since of course it'll choose to roll that 20% at the worst possible time. It's a personal preference thing, though - if the extra debuff seems worth it to you, go for it - it certainly *is* useful. Just be aware of the tradeoff.
@MuonNeutrino
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alright thx
I've rarely ever lost an Executioner's Strike due to aggro from the -Res proc going off. Also, you'll note that you'll be firing off Surveillance in the middle of combat more often than from hide, making it a non-issue.
The procs are pretty cheap so try it yourself before making up your mind. Personally, I love it and highly recommend it.
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if i have the -res proc in surveillance will it alert the mob when it goes off?