RAND-Walbundrie-Walla kicked seven goals to none after half-time to bring down Holbrook by 44 points at Rand on Saturday.
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With only two points separating the teams at the main break, the Giants found another gear with rebounding defender Justin Dickson and midfielder Chris Hutchinson leading the charge.
Coach Myles Aalbers was also pivotal in breaking the match open with three of his five goals coming in the third term.
Holbrook could only manage four points in the second-half with Dylan Fairall, WIll Heriot, Josh Jones and Will Heriot running out of support.
Heriot and big John Spencer finished on the bench with leg injuries.
The Giants went into the clash without key forward Josh Morris who faces a lengthy stretch on the sidelines due to injury.
Billabong Crows held off a fast-finishing Culcairn to win by 13 points at Culcairn.
Alex Brooks, Michael O'Riordan and Joel Stankiewicz impressed for the victors.