Though, just noting that the SO3 team only has to status (freeze) Rand to be able to target other PCs. Even with the status healing that Sage's team has, it might be worth noting.
Actually they have to kill him before they can target other people, by the original phrasing.
There's nothing specifically stating otherwise, so...he has to be the target of all damage and status until he's no longer a valid target. Stoning him would probably work, depends on the Stone arguably but unless it's one of those overglorified Stops I suspect people would take that as disabling enough regardless of if you can still beat on him. But...it doesn't really specify that fatal status that leaves you a normally valid target(if Freeze was fatal, which I thought it wasn't? Thought that was paralysis but I dunno, been a while.) keeps him from getting beat on.
(Actually, by the original phrasing, Rand's a valid target for REVIVAL if KILLED and the enemy is attempting to use REVIVAL AS OFFENSE DUE TO ZOMBIE, arguably. The effect doesn't actually cut off while dead based on what's said, just that this makes you no longer a valid target. Never mind that it wouldn't do anything, there's still nothing preventing him from being a target! Yunalesca slayer.)
Although freeze does help with damage there if I recall it's mechanics right.