When the first player moves, the time starts there. For example, Let's say both players start recording at the same time. Player 1 moves in the 3rd second of recording but Player 2 moves in the fourth second of recording. The time would start on the third second of recording. You don't have to press record at the same time, but it really helps with timing. The time stops when both of you reach the end. You can both help each other, like doing Frog Jumping (which would be put in glitches) or just boosting, but I have only found 1 usage for only 1 player with boosting. Also, good idea for one of the players could be used for height.