>>96286999

Page 272 says, though:
>Slamming Into Objects
>When a creature force moves a target into a stationary object that is the target’s size or larger and the object doesn’t break (see below), the movement ends and the target takes 2 damage plus 1 damage for each square remaining in their forced movement.
>If you force move a creature downward into an object that doesn’t break (including the ground), they also take falling damage as if they had fallen the distance force moved and their Agility score was 0 (see Falling above).

Page 272 specifically permits slamming "into [...] the ground," whereas the glossary forbids it.