Just now I was fighting the Glemyos Wildhorn WB with several other players. The boss spread his arms to summon some adds. I turned around and saw an indrik, so I attacked it and it died. Then I realized that it was one of the firey indriks that sweep across the boss's area in a line, and that by killing one of those indriks I had made a rather sizable gap in the line. I'm not sure, but I think the one I killed may have been on one side of the smallish gap that you need to use to escape death.
When the line of indriks appeared again, I ran over to see if I could kill one of them, to test if it had just been some kind of fluke, but I wasn't fast enough to kill it before the line of indriks started to move, so I died.
Does anyone know if this is actually a thing? Is it possible to kill one of the fiery indriks before the line starts to move, in order to create a large(r) gap in the line?
I've fought mudcrabs more fearsome than me!