Stop, figure out what went wrong, and start again. It's not like reading music, where you just keep on playing through the mistakes. In a performance, it's probably best to just let it go. When they did, everyone in the nervous crowd cheered wildly. When dancers form a circle for couples to show off, now's your chance.
Leader has two hands always on follower.
Follower has both hands on the leader, although she really doen't need to do so. Wide margin for error. Mild average worst-case scenario. Leader has two hands on follower, but less margin for error. More strength required of the follower.