Ruiz to referee Saints again in quarter-final clash with Ulster
Ruiz dished out three yellow cards to the black, green and gold during their incredible comeback win at the Dragons last Saturday.
Ollie Sleightholme was sin-binned during the first half, with Alex Coles and JJ Tonks following in his footsteps in the second period.
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Hide AdSaints were down to 13 men with Coles and Tonks off the field, but Chris Boyd's side roared back from 39-24 behind to claim a 43-39 success and book their place in the last eight.
They will now host Ulster at Franklin's Gardens on Saturday night (kick-off 8pm).
Ulster were big winners against Harlequins at the Twickenham Stoop on Sunday night.