Please fix the monkey version that spawn from vaal temple

You guys know the bosses that spawn after we clean a vaal temple area in a map right?! Why is there a monkey boss that spawns out of blood and he spawn time with the slam (that is hit kill to most characters in this game) already charged? Please I need to see any of you guys play this encounter and have a reaction time of identifying that is a monkey appearing and dodge that, I've died 2 times and lost the map cause of a hit from a thing that wasnt there a literally second ago.

Fix this will you? The game need to be clear when there is danger, by the way, those were my only deaths in like 2 days... so my character is kinda ok in defences and is just the slam that's doing what supposed to, but the escape or dodge windows in this vaal temple version is just wrong.