Vigil had managed to cut himself free, slicing off the Tentacle that was coiling around him and allowing him to drop onto his feet on the other side of the floor with the twitching, bleeding Tentacle still on him.
There's rippling in the water, this seems to have upset whatever is down there.
The serene valley of snow is then promptly disturbed as Kaito's MAG crackles out, spitting out metal at supersonic speed that puncture the dense water surface. Some more blood shows up on the dark surface before everyone's teeth shook as Stella fired her Gauss rifle, the shockwave from the tungsten stake the width of a soda can suddenly achieving Mach 4 the moment it exited the barrel blew nearby snow and dust away, several bricks of the ruin was shaken loose and the sound echos through the Valley like an explosion. Your suits whirrs and whines as it fought against the push, Priscilla's unpowered form was pushed to the ground from the force and rolled like a stiff ragdoll until the wall stopped her.
Then the metal slug made contact with the water surface at Mach 4, it might as well have been hit by solid concrete as the water surface and the slug positively explode as if Danh threw a grenade in there, the explosive force collapses another section of the floor, near where Vigil is standing and did manage to blow him onto his back from the contact shockwave and some Tungsten Fragment travelling at supersonic speed.