Game Mechanics: Stun from behind code seems to be on green

[Sunderfury]

Just to perhaps close the books on this, since Dolalin uncovered beta and early launch patch notes it's given a bunch of insight into evolution of game mechanics. They've been added to the wiki with links to the source material.

This is a patch note from January 1999 beta that strongly indicates flee stuns were in since launch:
https://wiki.project1999.com/Patch_Notes

January 5, 1999
Increased chance of being stunned when chased.