Can you use Yasuo's legend ability to recall him immediately after he starts an attack?

Ruling: No, Yasuo's legend ability cannot be used during combat because it has base speed (no action or reaction keyword). However, you could achieve a similar effect with a spell like "Ride the Wind" that can be used during combat.

Nuances:

• Base speed abilities (without action or reaction keywords) cannot be used during combat
• Spells or abilities with appropriate timing (like Ride the Wind) can be used to recall a unit during combat