The striker finished coolly in the seventh minute and again two minutes after the restart.
But with the score at 4-0, regular penalty taker Sam Bewick didn't step aside to let him take the kick after a foul late on.
Liam grinned: "I couldn't even kick a ball by then!"
He also revealed he had been down the gym every day in the closed season in a bid to improve his strength this campaign.
Hear what Liam had to say pitchside after the latch by watching the FTFC TV interview
here or by clicking on the link below.