that is an odd one,,,,
i would go back and have a look at the road first,, some very big pot holes around where i am at the moment,, then i think the bike needs a closer looking at,, are the tyres still inflated ? are the calipers tight ? are the pads still in the calipers ? is the chain still on ? etc , would think there might be a clue on close inspection,,
hope he recovers well ,, best of luck
i would go back and have a look at the road first,, some very big pot holes around where i am at the moment,, then i think the bike needs a closer looking at,, are the tyres still inflated ? are the calipers tight ? are the pads still in the calipers ? is the chain still on ? etc , would think there might be a clue on close inspection,,
hope he recovers well ,, best of luck