The Bald Faced Hornet's story is like a Shakespearean Drama.

Beware. These ladies take their work seriously. If you mess with the colony, they may squirt venom into your eyes, causing temporary blindness, in addition to stinging you. But they'd prefer to go about their business of maintaining the nest, gathering nectar and foraging for flies and other insects.
While taking pictures several bees veered away or bounced off of me, until I discovered I was in the flight path and moved. They allowed me to remain close, with no stinging. It's easy to respect these amazing creatures and their life processes. Thanks ladies.