The Split
The moment: a 90-second gateway problem has sorted the room. Twelve students are ready to proceed; eight need a reteach. Both groups are looking at you, and you have one body.
- Group A first: task + time + “do not wait for me.”
- Group B second: a destination and something to carry.
- The curveball, one calm line: “You solved the gateway—I need you on the challenge. If it falls apart, you know where I am.”
Time every rep. Under thirty seconds. Swap roles and go again.