Skipped Belt and Worn Out Pulley

Two days ago I went to drift with my friends at a new parking lot..Surface was not so good , many small stones were covered the road and grip was not good at all.I set up a small track and we started drifting.After first battery pack has finished I changed the battery with a charged one and started drifting again....The car suddenly started having oversteer very much and at the same lap I saw that front wheels were not turning.Like I expected the belt was skipped and the pulley was worn out by a small gravel particle.