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The effect of "Stumbling" goes on a chain immediately after a monster is Summoned. As a mandatory Trigger Effect, "Stumbling" is always on the chain before optional Trigger Effects ("Mobius the Frost Monarch") or chained Spell & Trap Cards ("Trap Hole").
Any monster that is Normal Summoned, Flip Summoned, or Special Summoned is changed to Defense Position.
"Stumbling" changes a monster to face-up Defense Position, not face-down Defense Position.
The mandatory Trigger-like Effect always starts a Chain in the Summon response timing, even if the monster was Summoned by a card effect as Chain Link 2(+).
When "Stumbling" and "Final Attack Orders" are both active, a Summoned monster is changed to Defense Position, then changed to Attack Position.
This effect activates as soon as a monster is successfully Summoned (or simultaneously with any mandatory Trigger Effects) before optional Trigger Effects (Red Gadget) or chained Spell / Trap Cards (Trap Hole). This supersedes Ignition Effect Priority.
If "Stumbling" is in effect and you Summon "Exiled Force", and your opponent has "Trap Hole" Set, "Stumbling" initiates a chain with "Stumbling"'s effect as Step 1. Your opponent can activate "Trap Hole" as Step 2. You cannot chain "Exiled Force" because its effect is Spell Speed 1. Therefore "Trap Hole" will destroy "Exiled Force" before you have a chance to Tribute it.
Example: Player A controls Stumbling and a set Trap Hole. Player B Normal Summons Exiled Force. Stumbling’s mandatory Trigger-like Effect immediately starts a chain as Chain Link 1. Player B CANNOT claim 'priority' to activate Exiled Force’s effect, but activates Mystical Space Typhoon as Chain Link 2 targeting Stumbling. Player A responds by activating Trap Hole as Chain Link 3. When resolving the chain, Trap Hole destroys Exiled Force, then Mystical Space Typhoon destroys Stumbling and the chain is considered resolved (as Stumbling is longer face-up on the field to allow for Chain Link 1 to resolve). The last thing to happen in this case was the destruction of Stumbling.
If "Dream Clown" is Summoned while "Stumbling" is active, and changed to Defense Position by "Stumbling"'s effect, "Dream Clown"'s effect activates after "Stumbling"'s effect resolves.
If "Stumbling" is in effect and you Summon "Exiled Force", and your opponent has "Trap Hole" Set, "Stumbling" initiates a chain with the effect of "Stumbling" as Step 1. Your opponent can activate "Trap Hole" as Step 2. You cannot chain "Exiled Force" because its effect is Spell Speed 1. Therefore "Trap Hole" will destroy "Exiled Force" before you have a chance to Tribute it.
If "Dream Clown" is Summoned while "Stumbling" is active, and changed to Defense Position by the effect of "Stumbling", the effect of "Dream Clown" activates after the effect of "Stumbling" resolves.
[FORUM] The effect of "Stumbling" will not keep you or your opponent from being able to activate Trigger Effects, such as "XX-Saber Boggart Knight", "Marauding Captain", and "Trishula, Dragon of the Ice Barrier".