In your first video LOTR2013......maul hits rey with his lightsaber strike right after you hit rey with lightning stun and knocks rey out of stun....so there is no stumble that is going to happen to rey and her stance. Please note that ALL lightsaber strikes take people out of stun lock. Lando's multishot, Han's Detonite Charge, force pushes, force pulls, and force chokes all take people out of stun lock.
In your second video with luke you were hit with lightning stun attack and you side strafed. If you side strafe at the exact right time the ability will have NO effect on you, but you have a very limited window to side strafe to get the ability to miss. If you are at the very beginning or near the very end of side strafing and rolling you can stumble from the ability, but not be fully effected by the ability. With standard characters roll it's the same thing as lightsaber heros side starfing. Again if you are hit near the end of the side strafe with immobilizing stun abilities and attacks the ability will not affect you fully and will only cause you to stumble just like if you block at the last second too. If you time the block perfectly or side strafe perfectly you won't be affected at all.
This is what is happening with these two videos of yours. There is no problem with the way that abilities work in these two videos. Just your understanding of how they work.
