It's only beetroot juice and water. Biodegradable and it was all washed off quite quickly.
I do generally sympathise with the aims and aspirations of Extinction Rebellion, even if I privately think the stunts are silly, but Jesus. That was pure comedy gold.
A friend of a friend is a volunteer firefighter and was working in the building today. He said to the colleague next to him:
"That's not how you hold a fire hose! It's going to.. oh! There it goes! So yeah, it's going to do exactly that!!"