you are partially correct. if the mob was capable of land movement it would, those who weren't would not. Blackburrow is the best example i have to offer on this.
If you engaged the gnoll brewer and ran in water he would follow you. if you engaged a gnoll underwater after it kills someone it would follow you to land. the sharptooth frenzy, or whatever the piranhas are called, would only agro in water and stay in water.
as you mentioned, the 2 enviroments were agro-exclusive of each other, also they would act as a line sight for each other. couldn't nuke water mob from land, or shoot an arrow into a land mob from water. etc etc
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