Macron wanted to punish Britain, but Tusk isn't having it. Tusk just could have told May to eff off, but I think he's hoping that the UK government will come to its senses and remember it is supposed to be in charge, and not the Murdoch papers, the Mail and others who have banged on about Brexit for the last 40 years.
It's interesting that May's fate was already sealed at the Battle of the Boyne.