Forsythe’s first-half goal condemned Larne to their first league defeat since the end of November as they were leapfrogged by Crusaders, who jump into fourth.
It was a quiet and uneventful opening to this match but it tilted slightly in favour of the hosts with Tiarnan O’Connor causing some trouble for the Crusaders defence.
While Sean Graham was also probing, it was Crusaders with their first, and only, chance of the first half who broke the deadlock just after the half-hour mark.
Blaney was the provider as he hung an inviting cross that Forsythe met with a bullet header that he buried into the bottom corner.
Gary Haveron’s men responded with efforts from Dylan Sloan and O’Connor but went in at the break trailing.
Phillip Lowry came close to doubling his side’s lead just after the break when he whistled wide from the edge of the box. O’Connor then forced a save from Jonathan Tuffey.
Shortly after, nobody in red could connect with Sloan’s low, hard cross but opportunities began to dry up as frustration grew among the home fans.
Despite Larne emptying their bench, there was to be no riposte and Blaney should have sewn it up in stoppage time but dragged wide. It mattered not as the visitors came out on top.
