Well, in all honesty - no one can tell you much of anything from those pictures.
If you could post the video, some of us could tell you something based on their movement, but only so much.
What would help is if you could describe the events a bit more - from what I gather, you heard jet engines and then saw these aircraft maneuvering
It sounds like a practice engagement. A lot of guard units will do training in prep for deployment, or will resume their standard routines once they
return to their station (which you then take notice to after getting used to not having them around).
But, I can't really tell you much without a bit more knowledge, and I'd like to hear your words first - not implant too many suggestions about what
I think you heard (or should have heard).