Questions

I guess I got lucky in my finale, since after a minute one of the Girgashiy went out of range and stopped interfering.

Okay, slight update.

Tested multiple times with friends.

Hardmode Girgashiy does not kneel from rA+ Spike. In fact, the highest spike we could test was r3, and that didn't make him kneel either.

Then I did a small amount of testing in Normal. A rank 5 spiker couldn't make him kneel. And a rank 3 spiker couldn't make him kneel.

Either it needs r2/r1 or it just needs more spikers. I can't test any more with these ranks, though. Anyone else got some ideas or info?

It doesn't sound like you ever got him to kneel, regardless of rank.

Sure you guys timed it right, and didn't accidentally hit him right before he landed?

If not then chances are glitch?

I think we timed it right. Got training for Countering with spike. That means the timing was good, right?

And yeah, for our tests, at least with only a single spiker, we never got Normal or Hard Girgashiy to kneel.

In that case, where does the "rank A+" come from?

Testing in Easy mode.

rB didn't make the Easy-level girgashiy kneel, while rA did.

With a single spiker, at any rate.

If you can't get the Normal level to kneel, I'd recommend doubling back to Easy and verifying the requirements there.

Yeah, that'd be good to verify again, but... Hard to double back completely, without skill untrain capsules, though.

See about finding a rB spiker and see if that won't make Easy Girgashiy kneel.