The Bombers won the possession count 30-15 in the first eight minutes of the third quarter, but it only led to two behinds.
GWS kicked the opening goal of the term through Toby Greene.
The Giants kicked three goals to take the lead in a five minute burst - the inside 50's were 7-1 in that time.
Paddy Ambrose is doing an excellent job on Jeremy Cameron, but the Giants spearhead has still managed two goals from his seven possessions.
76 per cent of the final ten minutes of the third term was spent in the Giants attacking half.
Orazio Fantasia grabbed his fourth late in the term to stem the flow of Giants goals.
David Zaharakis and Adam Cooney each have 20 possessions.