Aerials have 3 frames added to them because it takes 3 frames to leave the ground, so a 3 frame aerial would be 6 frames out of shield. So, since some characters have a 3 frame Up B, -3 would be unsafe against those characters. HUGE EXCEPTION: Jump, Up B, and Up Smash out of shield ignore Shield Drop frames. So if all else was equal, you could be as disadvantaged as -11 on an attack and still be 'neutral'. However, in Smash there is Shield Drop which takes 11 frames in Ultimate. In most games, being negative means you can't apply pressure since the defending opponent would be able to act before you as the attacker. Negative meaning the defender can act before the attacker.

About On Shield data: The +/- refers to who can act first after an attack hits a shield.

Grab after an attack hits your shield takes an additional 4 frames and does not incur Shield Drop.

Jumping out of shield takes 3 frames and does not incur Shield Drop.

Up B and Up Smash happen instantly out of shield and do not incur Shield Drop.

Dropping your shield ( Shield Drop) takes 11 frames.

Shield Stun is the amount of frames that the defender is stuck after Shield Lag ends.

Shield Lag is just extra freeze frames that both the attacker and defender suffer, so it does not affect frame advantage.

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Ult data