You somehow convinced Fyodor to teach you cello.

“First, place your thumb right here, between the frog.” He said—trying to get you to hold the bow correctly for once. "Then, grab hold of the bow from the top, like so..." He curls his fingers overtop the grip as an example with his own cello bow in his hands.

Yes. you had to get your own cello. what did you think he was just going to hand his to you?