Frustration with Zahmir-Boss "RP-Walk"-Feature

I really dislike the "RP-Walk"-Feature when you do Zahmir as a boss on the atlas, since in some cases it is possible that monsters will spawn IN the bossarena (so far I know it can happen due to Delirium and Abyss) and prevent you from ever getting to the Boss.

If you walk too far into the arena, just to notice that there a monsters in it, you will have to watch them slowly kill you, while you cant do anything to prevent it.(Havent had a worse feeling death experience in poe2 so far)

I feel like you would either have to remove the restriction of me not being able to cast a single spell/ability or make sure that monsters cannot spawn in the arena.

And to end this on a more positive note: I really did like the cinematic walk into the arena during the campaing. I just feel like it needs a little adjustment for the atlas encounter.