Appox wrote:
If one person dies, you both have to start over. But the person who didn't die keeps his stuff.
The person who didn't die loose nothing, except he must restart the current mission. Only the dead player has to restart from scratch.
Know that, in challenge mode, in the startmap, only teleporters already available for the all the players are unlocked. In normal mode it's the contrary. Of course, if the 2 players want to continue together, they have to restart from the first mission.