There's a downed chopper on the roof and if you step into its fire it makes your game crash.
"Assertion failed: inst->KPhysRootIndex != INDEX_NONE && inst->KPhysLastIndex != INDEX_NONE [File:.\KSkeletal.cpp] [Line: 595]
History: KInitSkeletonKarma <- KInitActorKarma <- AActor::setPhysics <- UObject::ProcessEvent <- (LavaVolume KF-PraisetheLord.LavaVolume0, Function Engine.PhysicsVolume.Touch) <- TouchTo <- AActor::BeginTouch <- ULevel::MoveActor <- KFHumanPawn <- APawn::stepUp <- (controller 0) <- APawn::physWalking <- APawn::performPhysics <- AActor::Tick <- TickAllActors <- ULevel::Tick <- (NetMode=0) <- TickLevel <- UGameEngine::Tick <- Level Praise the Lord and Pass the Ammunition <- UpdateWorld <- MainLoop <- FMallocWindows::Free <- FMallocWindows::Realloc <- 4C576C61 0 FArray <- FArray::Realloc <- 0*2 <- FMallocWindows::Free"