Create a multiplayer mission with 3 playable units (player1, player2, player3)
Place 1x Respawn Module, Infantry, playable units' side
Create init.sqf, in it add:
[missionNamespace, player1] call BIS_fnc_addRespawnPosition;
[missionNamespace, player2] call BIS_fnc_addRespawnPosition;
Have 3 players join the game, and have the third player kill first player1, then player2 (or the other way around). The first player to be killed should be unable to respawn correctly.