FellOutOfWorldEvent
constFellOutOfWorldEvent:EventHandle<{height:number; },Reliable,Entity>
On a dynamic body the step it fell below the scene’s
destroyBelowHeight, as Roblox’s FallenPartsDestroyHeight destroys a
part, with height, where its centre stood: the next physics step
destroys the entity unless a system has put its body back above the
height by then, so a ball game respawns its ball here rather than
losing it.