Jeremy Corbyn answers question about Isis, is still somehow accused of ignoring it

Jeremy Corbyn has been accused of "ignoring" a question about Isis, when asked about the terror group during a discussion that was supposed to be about train fares.

The Labour leader was at King's Cross in London on Monday morning during a protest against the hike in ticket pricing.

Corbyn, who is urging the Department for Transport to stop rail fare rises, was answering questions when a journalist asked him:

I have to ask you, I’m sure you’ve seen the front pages today, what do you make of this new Isis video featuring a British man?

Corbyn told the journalist:

I'm talking about railways this morning... I'm talking about railways this morning. I'll come to you in a moment on that, ok? I’ll do a separate [answer] on that, if you wish.

Strange definition of "ignore"?