When you find a mistake, they are quick to point to their partner as having made the mistake. You can make them share one pencil if you want to make sure they take turns. If you feel that your class is going to have trouble with behavior during the activity, duplicate one worksheet for every student. Start them out with Rallytable, but if they aren't following directions or you see off-task behavior, give them ALL the worksheet and have them do it independently. You can collect them and check for accuracy, but don't record grades for individuals.
Rallytable activities are primarily for practice.
You may want to follow up with an individual homework assignment or short quiz. If you give homework, give a smaller amount than normal since students won't need as much practice. For a great teambuilding activity, use the Buddy Venn Diagram. Partner A writes their name in one circle and Partner B writes their name in the other circle. Students take turns calling out character traits, hobbies, favorites, etc.