Began reading the IC's first post to get an idea of what's going on and straight away, these supernatural things are serious business...

She followed the demon through the portal and was over London and then a few moments later she and the Demon were close enough (or over) the channel that the Demon actually fell in it... Like... Holy Hell That's like 70 miles (or 40 if you count the wide mouth of the Thames part of the channel) in seconds... That's 144,000 to 254,000 miles an hour (And I'm using Imperial coz... well it's in London)

That... or I'm overthinking things... Hopefully the latter...