LOL great find junior!
This what they call in the industry, a "B-roll". A supplemental or alternative footage to be intercut with the main sequence/story, a filler so to speak.
You found the full source - excellent! However, stations that have used this footage, have not used the full length for the audience to have the chance to understand that.
This is the Channel 4 segment in question, from their own YT channel.
You look at that and listen to the reporter talking over. Notice how they only used 11sec out of the full 120sec. What are people watching this at home supposed to think, if not dishonesty from the network?
https://youtu.be/qIRml8gyeSE?t=144
Btw, I expected more from Reuters being a 'wire' and all, but it seems they're not completely honest themselves about the incident and are aiding CH4.