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The splattered sludge and wrappers and carrier bags envelop his helmet and as he is cursing and struggling with disentangling himself, with only one hand upon the handlebars, the other gripping his handgun, the front wheel of his bike pitches over some irregularity in the road, skidding as his rear wheel loses traction and flips him over, launching him and his bike through the air, head over heels.
You are not quite sure where or how he landed but it is probably quite life-alteringly painful.