The 26-year-old's woes began when a knee injury suffered in 2011 required an operation and put him out for a year. He returned to action at the tail end of the 2011/12 campaign only to suffer another serious injury in the first match of the following season against Dalziel.
"I detached the tendon and tore my hamstring in three places and it was just gutting," he recalls. "Having worked so hard to get back to fitness, watching the rest of the season from the sidelines was tough, but the guys made it easier by doing so well winning RBS Championship A."
Another year of intense rehab followed before he was fit enough to take up a place on the bench against Dundee HSFP in the RBS National League at Mayfield.
The plan was to get a 20-minute run out, but when Scott Lang was knocked out after just 10 minutes Cassie came on for the rest of the game. "That certainly tested out my fitness," he said. "We were in the game at half-time at 10-10 before they ran away with things [48-17].
"When I was told I would be starting at stand-off against Kelso, there was a mixture of nerves and excitement. Having players like Andy Henderson and Hefin O'Hare outside me really helped. It was nice, personally, to get a hat trick, but more pleasing was the team's performance."