Description
Split the class in half. Assign group A and B (or whatever is appropriate) and set the timer. When you begin pointing and saying the flashcard, the JTE/HRT will point at the A side. The students will repeat. When you move on to the second flashcard, the JTE/HRT will point at the B side. The students will repeat. This will go on until the timer beeps. Whichever team the JTE/HRT is pointing at when the timer goes off gets one point. Repeat the process.
Notes
You know your students. If they’re going to complain about the winning/losing team, don’t play it. I’ve had a class where the students really went after the teacher for their choices in selecting groups and points. If you think this might cause your teaching partner grief, avoid it. It’s not worth killing the atmosphere for your teaching partner and students!