No Risk...

If unit's Spd ≥ 30 at start of battle, inflicts Atk/Def/Res-4 on foe, deals damage = 20% of unit's Def (excluding area-of-effect Specials), reduces damage from foe's attacks by 20% of unit's Def (excluding area-of-effect Specials), and unit's next attack deals damage = 40% of foe's first-attack damage prior to reductions during combat (resets at end of combat; only highest value applied; does not stack), and also, if unit's Def > foe's Def, triggers 【Potent Follow X%】during combat (if unit cannot perform follow-up and attack twice, X = 100; otherwise, X = 50; "at start of battle" excludes increases to Spd granted after ally is deployed, such as Legendary Effects, Mythic Effects, Bonus Heroes, Great Talent, etc.) 【Potent Follow X%】 Triggers an additional follow-up attack immediately after unit's standard follow-up attack and deals damage = X% of unit's normal attack damage (if unit cannot make a follow-up attack, this effect triggers when the standard follow-up attack would occur; this effect is treated like a follow-up attack, so effects like "reduce damage by X%" still apply, but this effect is not affected by effects that prevent follow-ups or "attacks twice" effects; only highest value applied; does not stack).