I'm sorry, but I'm not sure what you're asking. Are you wondering how to have different spawn areas for different rounds in Slayer?
For the first round I want red to spawn on one side and blue to spawn on the other side. The players will play the game as they normaly would untill the round ends. Now for this round I want blue to spawn on the side that red spawned on last round and red tho spawn on the side blue spawned on last round. Like grifball. How can I make this happen for a slayer gametype?
If you're doing a 1 life type game, I can think of a way. Make neutral points with respawn zones for each team for the first round. Then lay initial spawns with delayed timers on the corresponding side. ( Should work in theory. )