Are you sure?
I don't think this is correct. I did hunted Prots with walking backward and ml-35, meaning that they never got close enough to hit me and they never get stuck.
Moving mob do not get stuck/'unhittable'.
I hunted prots but didnt tryed to move back as out of habit so you could have right.
After all we all become noobs again after each VU to see, try and test all again.
I had in mind firstly small slow mobs as we talk about starter armor pack
Also if you tag/shot mob, turn and run he will newer get stuck, he will follow you or try to get you.
So that distance do not count for what i mean.
I think that maybe mob AI have "run mode" stance and "combat mode" stance.
In past it had also "run away" stance - if you damaged mob a lot mob tryed to run away.
Maybe still have - i dint notice it for long time and MA periodicaly improve mob AI.
Thing happen once mob come in close combat distance where it acualy can hit you and you evade atack by your defence skills or by moving bacward keeping same distance or slighty increase distance ( wich is not same as turn and run where mob shud change from combat to run/follow mode) so mob stay still in combat mode.
After certain unsuccessful number of tryes to hit you in time period and being constantly damaged by your gun mob go in stuck/unhitabe mode where cant be damaged further.
Not only damaged by weapon, thing worked without dealing damage just by healing myself.
I said - it worked because is long time i dont try that.
For long time i dont move bacward but just tank/evade mob hits until is dead because of those two reasons i mentioned in prior post - healing by 1/4 of fap full capacity and possibility to get mob stuck.