This was fun! Helped him a bit during level 1, but I tried not to say too much about the tactics during level 2. It was fun watching him try to solve it, while also getting help from fellow viewers who were trying to solve it with him. Lots of positive feedback in the chat, for all facets of the mod
I think the chat is just a temporary thing, only displayed during the live streaming. I think I joined in about 10-15 minutes into the livestream. Skip to 25:00, I think that's where he starts playing.