so. im in middle school, and i had never played middie before my last game. i have a few questions, just so im not as bad as i was during that game

idk if he was a middie, but when the player had the ball, he ran the whole field and he started on the defense side. was it because he was being on defense while being a middie, or does possession grant you the ability to be able to go anywhere on the field? and if it was because he was a middie and not that he had possession that he was able to go the whole field, if youre on denfense and not on middie, do you need to pass it to a middie?
sorry if thats too complicated [idk any better way to state it]
[in middle school] someone on my team playing defense went the length of the field. was it cause he was a middie playing defense or because he had possession? and if you gain possession and youre only on d, and not a middie, do you need to pass it to a middie, or does possession let you go anywhere on the field?