Actually, I suspect he realized why she was taking the picture, wanted to make a gesture indicating he respected her viewpoint, was distracted by - you know - g

Actually, I suspect he realized why she was taking the picture, wanted to make a gesture indicating he respected her viewpoint, was distracted by - you know - giving a talk, thought "hey, a bottle of hot sauce! oh wait, throwing it might be misconstrued", and passed it over. Hilarity then ensued.