As long as sneak is successful before you stand up (and the mobs aren't facing you obviously) it doesn't matter if you sneak before or after mobs turned around.
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Green
Tofusin - Monk <Force of Will>
Manowarr - Druid
Blue
Tofusin - 60 Monk <BDA>
Shiroe - 60 Enchanter
Manowarr - 60 Druid
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