This paper burns but does not catch fire --- what is the reason?

In this video, the Crazy Russian Hacker presents a very simple experiment to demonstrate the great capacity of metal to conduct and absorb heat.

As we all know, kitchen paper towels catch fire very easily. However, when they are put inside of a metal strainer the paper towels burn -- but without catching fire!

In fact, the metal strainer absorbs the vast majority of the heat so that the paper towels never reach their ignition temperature and therefore never catch fire!