Did I almost faint at kickboxing, (symptoms)?

My kickboxing master made me do squats with him on my back. I mean im 5'3 & 140 lbs and hes 5'8 like 180lbs probably. He got on my back like i was giving him a piggy back ride, and i had to do sqats with him on top of me for like 3 minutes straight. After that my vision got blurry and my ears started ringing, it was super weird. What happened?