The lights sound like the fall damaged either the connection to the rear (most likely if both have gone, does the break light stil lwork?) or the indicators themselves have been damaged. The front ones will flash faster because the rear ones arnt work (ie. dont worry about them, when the rear ones work they will return to normal. something to do with the amount of resistance in the circuit, someone with better electrical knowledge could explain). Wouldnt have thought starting the engine with no oil in would be a good move (or was there still some inside?). also the engine would have flooded when the bike was sideways, so letting it drain then trying it might have better success. Otherwise does it spark, starter motor work, fuel lines intact. many things to check, hopefully someone can give you a more structured checklist (EAB i'm looking your way ) Bad luck with the off, sounds like a prat, well done for avoiding him though! glad your not hurt