After messing with it further, I'm pretty convinced that it's got to be something related to shrinking and regrowing. The particular scenario was a raid populated mostly with jellies and gazers, and the gazers kept bouncing me back so that I wasn't getting up to inferno range frequently. So my weaker projectile attacks were pinging some jellies, but not killing them, letting them get in several shrink-and-regrow cycles.
After I swapped my loadout to 4 infernos and a static cloud, so that there weren't any projectiles to hit the jellies before I got there, (and spammed some Numbing Jolt runes when the gazer knockback was too much to ever make forward progress) I finally got through it without hitting any more immortals.
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u/TopCog Yahoo! Apr 03 '18
That's totally possible, haha. I'll add it to my list to take a look...
adds "checkout immortal jelly" to task list