Quick answer: apply Bleed before spending the main multi-hit attack, and make sure the party can maintain pressure long enough to benefit from the setup.
Why the pairing works
Bleed creates a shared target plan: one action establishes pressure and later attacks capitalize on it.
Party sequencing
Let the setup character act before the payoff character when possible. Focus the same target so the party benefits before enemies gain extra turns.
Version note
Exact hit counts and coefficients should be read from the live ability text. Older equations have been removed from this page.