Teachers should recall all the blocks that you have taught in previous lessons.
Teachers should help Students use the Broadcast control and perform various activities which will improve their computational thinking.
Teachers should explain that timing between sprites can be done using wait or using broadcast messages. Teachers can explain why broadcasting is better. This way change in one portion of the story will not affect other things. Also errors in timing (if the system is busy) will not add up.
Teacher should explain the difference between the broadcast and broadcast wait.