Hm. That music seems a little out of place now that I think about it. Oh well,
To sum up make sure you know your limits as doomguy. You see me instantly run away from the horde after I reveal them. You don't wanna push too close to a horde and risk having one run behind you; this is what causes you to either dodge into multiple zaps or get blocked as you are trying to hide. At the same time, you have to keep dealing damage to them which is where the timing comes into play (as well as prefiring when you are in a position to do so). If they get too close in a fight like smax26, make use of the rest of the arena so you can put some distance between you and them. Practice. Practice. Practice. Be patient with yourself as this is a very precise skill and I still mess it up to this day.
I hope this helps! I tried to cover all the aspects of these kinds of fights, but if you have questions, feel free to ask in the comments.
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