I was playing in normal survival the other night and antagonising endermen which I find to be fun. Whilst killing them from my 2 block high protection I noticed that once they had fell into a creeper hole near water, they stopped attacking no matter what i did to encourage an attack (looking at them and hitting them from 2 blocks away). I was able to go out and continue hitting until they died.
I looked it up, started to type a reply, but accidentally closed my browser window. Water made them lose aggro from Java versions 1.0-1.8.9, then for 1.9, it supposedly was changed to not matter. I lost my post, but here's the link: https://minecraft.gamepedia.com/g00/Enderman
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I am on the latest version and yes I believe the endermen did step into water or at least very near it. What I do not understand is that after they left the we area they no longer attacked despite my staring at them from only a few blocks away and then when I attacked they just took it until they died. Very strange....