Sometimes (I'm not sure about pre-conditions) player may not be able to choose his spawn point. Then, in the middle of round, he can spawn totally randomly, and either die or discover, that he is very, VERY far away from play area (this is actual for any gamemode and any map - I've been spawned in 500m away from Radio tower in Raid mode. Interesting thing was that... I played as a defender. Same happend with another player (La Trinité/Raid) - but his respawn was placed 11000m away from play area.