REDU format ruling
Stumbling

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Any monster that is Normal Summoned, Flip Summoned or Special Summoned is changed to Defense Position.
Rulings
Any monster that is Normal Summoned, Flip Summoned, or Special Summoned is changed to 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(+).
- 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.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.