He was talking about Halle's car accident that was a hit and run. She fled the scene. So saying she crashed in to him and kept (going/walking) didnt say anything and kept going is definitely a joke that'll piss her off
I remember Alan Carr talking about the Lindsay Lohan interview. Don't know if it's the same around the world but on UK talk shows most of the questions/conversations are agreed on in advance between the people running the shows and I'm guessing the managers of the celebs. Apparently Alan's team were told that Lindsay was happy to literally talk about anything but then in the moment she gave him nothing. It was sooooo awkward! (Also, his accent is "Northern" English, also very camp!)