If any of the front floor checks has a slant at least classified as steep (i.e., at least one of the X or Z axes has a slant of more than $2$ clicks), and the front floor is higher than the current floor, handle it as if it were a wall (override the height with $-32767$).
If any of the front floor checks has a slant at least classified as steep (i.e., at least one of the X or Z axes has a slant of more than $2$ clicks), and the front floor is lower than the current floor, handle it as if it were a pit (override the height with $512$).
If any of the front floor checks has a Death command, handle it as if it were a pit (override the height with $512$).
Probably only means that Lara will collide with enemies, otherwise she will only pass through them.
Probably only enables some sort of stumbling effect when EnableBaddiePush is enabled and Lara collides with an enemy.