Elemental Wormhole Generators?

This is the first elemental wormhole generator I’ve seen. Are these rare? It’s like a Vladof AOE grenade with a singularity generator. If they actually pulled you in with any significant force, they might be an interesting challenge.

That’s deployed by the unique mini boss corporal Bob. There’s a challenge to kill him before he deploys his wormhole.

Is it always fire?

Yes. There’s only this one enemy in the whole game that does it.