if it spun a bearing you're looking at a crank, at least 1 rod (if it was a rod beaing that spun) and a complete set of crank and rod bearings. expensive, yes. labor intensive, yes. does it usually happen from overfilling the oil? no, not really. but if you have a defective oil filter (seen it happen a few times) you'll get little to no oil flow and that can most certainly spin a bearing. though you'd usually know that b/c the oil light will usually stay on.

if your friend that changed the oil filled the cases until the oil was in the sight glass, but did so with the bike on the sidestand and not straight up and down, it's probably waaaaay over full, which usually blows ALOT of oil into the airbox via the crankcase vent, which then gets sucked thru the intake tract and burned, which smokes like crazy and fouls plugs with a quickness (probably why it died and won't restart). as far as the noise? could be alot of things. hard to say 100% without hearing it myself. if it started to blow ALOT of oil into the airbox and into the cylinders, it can lock the motor b/c such a massive amount of oil won't want to compress. that can bend a rod and the excessive pressure can screw up the rod bearings.