took me a bit to process wtf i was seeing, but basically what I just got out of all that, was:
"WHAT NOW, REIMU?" with the ultimate public act of defiling her shrine, right in front of her. further emphasized by the 'Whatcha gonna do about it?' sort of body language
...but reimu is still stuck in utter disbelief. after all, who would even think of doing such a thing, much less actually pulling it off.