Tangent sighs, and then sticks his scythe out.
A wheel of runes, inscripted as white lines floating in the air, appears around him and begins to turn. The wheel blurs and splits into two wheels, orbiting around Tangent. Tangent spins his scythe in the air, and it forms another, smaller wheel. The wheel expands, and blurs into another two wheels. The four wheels moved themselves into position around the four targets. They closed in... and in a flash dissapear...
Tangent casted Wheels of Chaos!

Lem_Gambino is frozen, asleep, berserked, scared, slowed, silenced, blinded, and poisoned.
Xion is frozen, asleep, berserked, scared, slowed, silenced, blinded, poisoned, confused, and stunned.
Bulla is frozen, asleep, berserked, scared, slowed, silenced, blinded, poisoned, confused, and stunned.
Trunks is frozen, asleep, berserked, scared, slowed, silenced, blinded, poisoned, confused, and stunned.

Actually, all the three bosses you fought had full overdrive meters. Tangent just never had a chance to use his in the first fight, and never had a need till now.