One of my players rolled a Rogue Thief. At level three they get the following feature:
Fast Hands: You can use the extra action granted by your Cunning Action to make Dexterity (Sleight of Hand) checks, use your thieves’ tools to disarm a trap or open a lock, or use an object in the environment.
The player asked mid-fight to use a Sleight of Hand check to disarm a foe. Since this isn't clear in the PHB, the discussion slowed down the fight considerably. To end this discussion I ruled a SoH check against the enemy's Strength (athletics) check.
I still find it hard to see how a SoH check could work to disarm mid-combat, since there's no way you'd be able to "sneakily" take someone's weapon out of their hands while fighting.
There is an optional "Disarm" rule as listed in the DMG, which uses a weapon attack against an adversary's Dex(Acrobatics) or Str(athletics) check to determine whether or not a disarm action succeeds.
Any insights? How have/would you guys rule this?