It's documented in my version
(start with -listscriptfuntions)
TServerPlayer.isblocking - makes the player blocking or non-blocking on the current client only
There can also be other ways to handle this:
- on server-side set the player classic health to zero while the player is dead (player.hp/hearts)
- on client-side you can use TServerLevel.isnopkzone = true/false, you can set this before using onwall and unsetting afterwards