Trial of Sekhemas, 4th floor. Artillery monster

So, I've been doing some trials lately, and although most of it is fine once you get good enough relics.

There's one thing that Really, really bothers me.

There's an artillery rare unit that spawns sometimes on the 4th floor, in normal "kill all rares" types of encounters, they're fine because they actually give you time to kill them.

But on the "survive" encounter, Although I KNOW he can spawn, I KNOW he WILL one shot me.

I'm running , sweating, +40% movement speed, trying to find this guy before he has a chance to artillery me.

If by ANY CHANCE, I miss him by a quarter second. It's over, I'm dead.

75% honour resist, major Energy shield. doesn't matter, he kills me as soon as he enters my screen.

Pretty sure the problem is that the ennemy himself shoots the artillery in the air while offscreen, and as soon as you enter his presence he rains it down on you instantly.
so this is easilly fixable but a major major problem for sure.

I feel bad for the people running they're 4th ascendancy's and getting killed by it