It was a performance of two faces by Arsenal on a night when they absolutely had to win; dropping points at relegation-threatened Luton is not a part of any championship portfolio.
For longer than anybody connected to Arsenal will care to remember, it looked like being a tale of their defensive softness. That, and the steel and silk of Luton – all of their players bringing the former; Ross Barkley, the best player on the pitch, contributing the latter. In abundance.