As a Celtic fan I thought that was one of the most clinical displays I've ever seen from a Scottish team, away from home. Absolutely clinical. Three chances, three goals, tactically superb, job done.
Suppose the only concern is Lyon punt Perrin (they'd probably be better with Reggie Perrin) and get in a decent coach before Rangers play them again. However, can't see Rangers conceding 4 goals at Ibrox, therefore you've got to assume that Lyon are done and dusted, if the points are level.
Congratulations, I only hope my team can do something similar against Milan