A Swallow Tale

Here are four frames from a video which document
that even an agile Bank Swallow can have a bad day.
On this particular day several swallows were perched on tule stems
many of which were bent over nearly 90 degrees
under the weight of the birds.
Suddenly the group flew. One tule instantly flipped up
then back down braining an unsuspecting bird in the process.
Somewhat shaken the swallow flew off with the others.