in 2013, moltzen played the first six games at fullback. in round seven, he was moved to halfback to cover for an injured braith anasta. in the second half of the match he ruptured the acl on the same knee that had suffered the injury three years previously, and took no further part in the season. moltzen had returned from injury and was in pre-season training in december 2013, when he suffered a further injury to the same knee he later said, "from there it was downhill. i had no appetite. i was lethargic. i just felt and looked like shit. i was gaunt and pale. i kept going back week on week to get blood tests. they kept saying nothing was wrong. i went to bed [one] night and woke up and felt like my leg was wet. i had white sheets and my bed was covered in blood. i looked down and the stitches had popped." he remained at the club for a further two seasons without appearing in first grade.