stop carrying if you get downed (#2576)

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Shared/_DV/Carrying/CarryingSystem.cs

@@ -57,6 +57,7 @@ public override void Initialize()
         SubscribeLocalEvent<CarryingComponent, BeforeThrowEvent>(OnThrow);
         SubscribeLocalEvent<CarryingComponent, EntParentChangedMessage>(OnParentChanged);
         SubscribeLocalEvent<CarryingComponent, MobStateChangedEvent>(OnMobStateChanged);
+        SubscribeLocalEvent<CarryingComponent, DownedEvent>(OnDowned);
         SubscribeLocalEvent<BeingCarriedComponent, InteractionAttemptEvent>(OnInteractionAttempt);
         SubscribeLocalEvent<BeingCarriedComponent, UpdateCanMoveEvent>(OnMoveAttempt);
         SubscribeLocalEvent<BeingCarriedComponent, StandAttemptEvent>(OnStandAttempt);
@@ -158,6 +159,11 @@ private void OnMobStateChanged(Entity<CarryingComponent> ent, ref MobStateChange
         DropCarried(ent, ent.Comp.Carried);
     }
 
+    private void OnDowned(Entity<CarryingComponent> ent, ref DownedEvent args)
+    {
+        DropCarried(ent, ent.Comp.Carried);
+    }
+
     /// <summary>
     /// Only let the person being carried interact with their carrier and things on their person.
     /// </summary>