Hell, I have a 'S' triangle in my backyard. Ah but mine is in the DP's backyard...
Except everything you show is high altitude UFO and IFO events. Nothing that swoops down hillsides and selectively targets its victims three separate times at three separate locations.
It is logical that high flying UFOs will get photographed more frequently. As said before the NO2/N2O theory doesn't require any swooping. They exit the tent and are prevented from returning by an acrid toxic cloud which is also imo the best explanation for Chivruay. The "fire orb theory as seriously considered by the man central to the investigation and witness to all the evidence" suggests that BL was involved in the ravine deaths either by mechanical force, by explosion and possibly including a process similar to cattle mutilation.
Further wrt to "swooping", UFO accounts regularly state that the objects have approached and followed the witness(s) sometimes with negative outcomes (the assumption being that fatal outcomes get reported less...).