HONDA ACCORD TIRE FLAT

While Pulling Out Of Parking Lot At My Apartment Building In Reverse I Hear This Loud Noise. I Thought It Could Be A Flat But When I Got Out...

I Have A 1990 Honda Accord (stick Shift) And I Had A Flat Tire Yesterday(front Drivers Side). After I Put The Spare On So I Could Drive Home...

What Should I Look Out For Since My Tire Flew Off While I Was Driving Home At 25 Mph There Is A Slite Flatness On The Bottom Of The Rotor...