Mysterious cast is mysterious

Step 1) Open this video on YT: v=HQoRXhS7vlU
Step 2) Look at the following image:
Sorry for the spam but I really can’t understand this warning (WeaponInSlot class inherit from ItemClass class)! :V
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it can’t work, because you trying cast item class to weapon_in_slot. its like you want to get random static mesh from level and cast it to game mode… wheres mystery?