Okay in that time Louis totally rescued the stash of quidditch recordings and whatnot he and Minerva had had in a back room of the wandshop... probably felt tremors or whatever again and figured better grab all that and get out of dodge.
As for Kendra, since she was wanting to stay as close as possible to Ari she probably got injured helping out at the castle and... bugger, I couldn't decide yes or no so I flipped a coin and um... poor Kendra has been knocked unconscious. :(