Only saw the match live, so haven't had the benefit of watching replays.
The sending off looked harsh, first yellow was for winning a fifty fifty ball, the Alloa defender went in just as hard as Lyon, and made a massive yell which had the ref reaching for his card.
Second yellow, Lyon was running with the ball towards the central defender about 30 yards and put the ball past the central defender and tried to run past him, the central defender and Lyons collided and my first thought was that the defender was correctly being booked, for a body check, then to the shock of all watching a red card followed. Strange decision.