I found that the two Glocktigi are easier to battle when you are far away from them. What I do is keep running from one side of the room to the other side which will in a way keep the two Glocktigi in the center. When I am running I quickly switch from first person to third person to get some speed as I quickly pass the glocktigi they can't keep up with me. Thus as I get to the otherside of the room I quickly switch back to First person as I am quickly turning around faceing the Glocktigi. I pull out boom bats, thud slugs and bolamites aswell as sting bees which can be helpful and start shooting. The glocktigi spit the green slime at me and I wiggle myself free where I can have one more chance to inflict damage. Then they spit again and wiggle myself free now they are getting closer but this I repeat the process and move to the other side.
I am basically back and forth trying my best to keep my distance spite of the fact I am getting caught in their green slime. As long as you stay far from them you can beat them spite of being slimed.
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