Tips for melee combat/new player

I've played for a few hours now and could use tips on how to play a melee build/understanding game mechanics. I did a few runs around mars with Isabella and those went fine, main strategy was just sneaking everywhere, luring enemies through doorways and sprinting up to stab them to death. My last death has me confused, It looked like an enemy that I couldn't see yet sprinted two tiles through a doorway and used his last action to attack me with his wrench, I'm assuming I was stunned because the combat log showed he hit me 4 times before I died.

This has me rethinking how I should approach enemies in melee since I was full health and these were level 1 tech civil resistance guys, do they have the same limitations on movement/attack as I do?