You can fight in slow-motion by adding this line into the configuration file.
By default the slow-motion key is TAB, make sure to change it if you don't
want the TAB key as your slow-motion key.
Installation instructions:
1. Open the file "config.cfg", found in the Sauerbraten directory.
2. Scroll down until you can see the list of BIND commands.
3. Copy the line from the file "slow.txt" (the one I've published) and
paste it at the beginning of all BIND commands (this is recommended
for unexperienced people).
4. Change the key if you would like that. Just make sure that you've
spelled the name correctly and that the key is free to be set (the key
must not be used by another BIND command).
5. Save the file and run the game.
Using the function:
Keep the slow-motion key pressed while fighting. Your HUD (health, armor,
ammo) will not be shown when you are in slow-motion mode. Release the
key to exit slow-motion mode.
Here's a little tip from the author:
Bind this line to the CapsLock key.