Being aggressive grab/fireman carried and thrown down a z-level negates damage

## Testmerges
#9894: 'Multiz indicator' by Detective-Google at commit 5dbc10a0d2
#10340: 'New on_mobs for splints, bandages and blood overlays (Other changes to blood included)' by LC4492 at commit 14a671a4e4
#10830: 'cm-live' by hry-gh at commit 78f16819dc
#10895: 'Moves SDTimeAward out of staff ranks.' by realforest2001 at commit c7aee3b53b
#10872: '[RM] Temporary Multi-Z Roof Layer' by thwompa at commit 9e9443f789
#10883: 'Blocks tiles you cannot view while looking up' by Git-Nivrak at commit e83e2d8d9e
#10908: 'Disables pouncing up a z level' by Git-Nivrak at commit e2b48b63cd
#10926: 'Admin and XO medals.' by realforest2001 at commit 4e92970580
#10925: 'Cape River Mining Colony - Ground Map' by Steelpoint at commit d98d50cdb1

## Round ID
30557

## Description of the bug
I got aggressive grabbed/fireman carried by another marine and thrown into the 'empty space' in the middle-deck catwalks. I landed on the lower z level instantly and took no damage. My character was laying down/resting when this happened. I am not sure if resting is important to this working or not.

## What's the difference with what should have happened?
I would have expected to take the typical fall damage, as you would walking off the ledge instead of climbing down, due to 'not preparing' the climb safely.

## How do we reproduce this bug?
Use lay down/rest to lay on the floor
Have someone aggressive grab or fireman carry you.
Have them throw you into the empty space at a higher z level.
Land instantly and safely with no stun.

## Attached logs
```
N/A
```

## Additional details
- Author: Xindii
- Admin: Steelpoint
- Note: None