Both sides want to CC-lock the other's DPS first - Cheap Shot the Mage before he can Frost Nova, and pre-shield the Rogue against the mirrored opener.
Dispel Fear the instant it lands so the CC chain doesn't stall, then keep pressing before DoTs stack out of control.
Whoever lands Cheap Shot first while the enemy Priest's Penance is on cooldown usually takes the fight.
This is a favorable grind - out-damage the Paladin's heals with sustained Rogue pressure while the Priest denies burst windows with PW:S.