The afternoon of the 30th of June was dull but warmish [20 to 21 degrees] in the BBW [best Bucks wood]. Mick Campbell and I stood looking up at a line of Oaks above Sallows; nothing moved until, for a brief spell, there was hazy sunshine. Immediately we saw two pairs taking off and skirmishing about 30 metres apart; they sank without trace back into the canopy as soon as the sun disappeared.
On the 8th of July we returned to the same spot under completely different conditions: hot and sunny, windless, 25 degrees. Again we waited, staring up at the canopy. Nothing happened until a few wisps of white cloud obscured the sun, and this was accompanied by a slight breeze; immediately, a pair rose into the sky, clashing. Quickly, the clouds moved away, the breeze dropped, as did the activity.
Does HIM need a sudden change in the atmospheric conditions to stir him?