Hertfordshire still hasn't stopped

I enjoyed a very agreeable afternoon watching one and then two Purple Emperors at the Northaw Assembly area. I arrived just after 2 as the cloud dispersed and good sunshine commenced and almost immediately an emperor made a flight across the gap. He was a bit bored at first so he chased some bees and then a crow and some more bees...........but about 2.45 he was joined by another emperor (almost the same time last week kicked off) and their tussles continued for about 30 minutes when one finally disappeared for good, never to return. Which one it was is hard to say although I suspect it was the first one I saw that went. Both appeared to be in good condition so no obvious identification points although the second one might have been just a tad bigger? I left at 4 with one still flying in the gap in the sunshine having also chased a pigeon and a Purple Hairstreak.