After being damaged by a player, Endermen seem to lose the ability to teleport in order dodge melee attacks, and simply take sword hits to the face without teleporting once. They will still dodge before being damaged. Arrow dodging behavior seems normal

This also seems to cause Endermen to be unable to teleport out of water or lava, but it may be related to a different bug

Effects 14w06b, where Endermen were given updated AI.