depends on how hard you hit them, if you have a spike of huge crits landing towards them, and them whacking you at the same time, you may get the feeling you got 1 shotted instead

having high ar/armor with 1:10 ratio helps too in addition to life regen/LoH/LS because reflect dmg mechanic has to go through your dmg mitigation first. else you would be 1 shotting yourself all day erry day when you're doing over 300-400k dmg crits LOL

this only means you're life regaining at a faster pace than you're being damage reflected upon.

no such thing as RD no damage in return lol