What does screaming "Allahu Akbar" indicate then in your mind?

For me it indicates something that may or may not be true, since that's what the article indicates.

If the BBC have mentioned something like that then it is pretty much nailed on to be true. I know they refer to German media but if they can go out of their way to deny links to the RoP™ then they usually will.

Oh and:

German train attack: Afghan refugee 'had IS flag in room' - BBC News

There ya go.

So if the BBC says that claims of something are being investigated, then that thing is definitely a fact? Weird.

What's the RoP?

^Do you go out of your way to defend any other organization, or do you just have a thing for ISIS?

I haven't seen a single post from him defending ISIS.

Then you lack the ability to understand his analogy to the Jimi Hendrix poster.

Is this intentional or unintentional irony?

Er, no. That would be you.