Oh good ... I was hoping someone would know why wild birds would do such a thing. The first time I saw it happen was @ 12 years ago at our other house and I thought the bird was sick and possibly dying but like the Jay yesterday, once I walked towards it, it took off up into the tree.
I let the dog out a few minutes ago and when he took off out the door he startled a pair of Pileated Woodpeckers that were in a Palm Tree in the yard. One took off while the other flew to the Cypress tree. I see and hear these big WP's quite often but they rarely hang out long enough for me to get photos. This one stayed long enough for me to get at least get one picture.