There's a good piece of analysis here about the recent IS video which (I didn't realise 'til today) showed 19 men being beheaded, most of them Syrian prisoners.
And again, this branch of Islam's grandiose beliefs are important to understanding what is going on:
Unlike previous videos which are believed to have been filmed in Raqqah, a Syrian city which serves as Islamic State's stronghold, this one is shot in Dabiq.If ever a bunch of killers deserved to be blown up pronto by a drone, it would be the group of men who participated in this cold blooded, religiously motivated, mass murder.
The city features in a recorded statement attributed to the Prophet Mohammed, known as hadith. The hadith are very important to Muslims and are regarded as providing another source of law alongside the Koran.
Dabiq features strongly in the eschatological aspects of normative Islamic belief.
Based on Prophetic sayings, IS believes the town will take centre stage in a cosmic battle between East and West. The armies of Islam will triumph and the West will crumble.
IS will have chosen the town for their latest video quite deliberately as Western leaders are taunted to send ground troops. "We will break this last and final crusade," says "Jihadi John".