With the clock ticking down to 10 seconds and clinging to a four-point lead, debutant Daniel McStay was entrusted with the kick-in after a Ryan Bastinac behind.
The 19-year-old stepped on the goalsqare line, forcing a ball-up.
Thankfully for the Lions, the ball spilled into open space from the ensuing stoppage and time expired for them to win.
However, assistant coach Murray Davis said they had addressed the situation ahead of Saturday's trip to the MCG to play Richmond.
No-one had to tell McStay of his error – he felt bad enough as it was – but Davis said the entire process has been looked at.
"Even at our development session … we were practising kicking in and I was certainly watching Dan closely," Davis said.
"You learn a lot of lessons in your first game and he certainly learnt a big one in watching for that white line.
"It's important for Dan and for all our players to have an awareness of time on the clock.
"We saw Ash McGrath go down there and try to take the ball, and the umpire shoo-ed him away, but that doesn’t mean Ash still can't go and pick up the ball, and Dan has to have an awareness of that as well.
"It's part of the education process, definitely."
Aside from the late hiccup, Davis said the Lions had focused largely on the positives of the upset win over the Kangaroos.
He said the ball movement during the seven-goal second quarter was particularly impressive, but they would need to lock down in another area against the Tigers, who beat them in round five at the Gabba.
"We felt they got on top of us around stoppages, so that's probably been a big focus for us, our ability to win the contested ball and go from there," he said.
"Against North Melbourne we were able to score (from stoppages), the next thing is being able to defend and that'll be our focus going into Richmond."
