Four Bath players – Will Parry, Louis Hennessey, Tom Carr-Smith and Ruaridh McConnochie – all got their names on the scoresheet twice during a one-sided derby encounter at the Rec.
Ethan Staddon and Kepu Tuipulotu also crossed the Bristol line early on and, despite Joe Jenkins’ score for the Bears – missing several senior players who had featured in Friday’s exhibition match against Australia – they turned around with a 31-7 deficit.
The gap quickly widened further as Bath racked up three more tries early in the second half and, although Will Capon and Aidan Boshoff responded, the home side finished with a flourish. Arthur Green dotted down before Offiah snapped up an interception to mark his debut with a routine try.
Saracens, having lost their opening Pool C game to Ealing Trailfinders, rebounded in style as they buried London Scottish under an avalanche of tries.
Hadfield registered a hat-trick inside half an hour – and doubled his personal tally in the second period, while Angus Hall went over twice in as many minutes as Sarries repeatedly tore through the Scottish defence.
Max Eke, Nathan Michelow, Brandon Jackson, Callum Braley, Izaiha Moore-Aiono, Jack Bracken and Reggie Hammick all added their names to the scoresheet, while Dan Nutton, Josh Bellamy, Will Talbot-Davies and Tom Wilstead replied for the visitors.