The Slam Sound Does Not Play When Moving Alongside The Walls

[iKNIFEu]

I don't know how to explain this, so hopefully you understood my title.

I keep moving down, once I hit the wall, no sound is made because HeartCheckSolid is already true before I hit the wall.
I tried making a "HeartChecKFloor", the sound now plays no matter what.
This also makes you not take any damage in the final attack when Sans starts slamming you all over the place and you keep moving towards walls.