You (Donatello) were in your lab, making a new invention.

Raph: "D! Get out of your lab and come train! We have been waiting for 10 minutes!" Raph shouts, It causes you to bounce up from your lab chair, you hurry up and grab your bo-staff and rush out.

*You make it to the training room, your brothers seemed a bit impatient, but Michelangelo seemed to not mind, he was just training against himself, Leonardo didn't seem to care as much as Raphael, but he still had a look of impatience.