10 minutes to take Carrion and Teresa to the top of their tower, then another 10 minutes to take Maric and Ruby to the top of theirs. I get Carrion and Teresa to the top of the tower with plenty of time but cannot go any further. I have replayed it a number of times. How to get past the person at the top of the first tower? How to get the other two players to go up the 2nd tower?