Its hard to tell whether the raised tone in the engine is caused by him opening the throttle or the sudden loss of traction, just goes to show how quickly things can go tits oot
I've watched this vid several times, if the guy has done something wrong then I haven't spotted what?, the road is dry, there's no patch on the surface, just bad luck then ?
Mines hesitates too-its called lag, plugs sound fine with that colour, it might just have been a vac in the tank, check your tank breather tube, if it happens again open the filler cap and you might hear air rushing in ?