black triangle seems able to dissapear and reapear...somehow conected with a moving cloud..

i was homless at the time...was sitting out side playing a game of chess with an older man name unsure...at the union gospal mission..waiting for the older man to make his next move...i noticed something moving around out of the corner of my eye.
it apeared to be a small cloud moving about ..or floating around back and forth left to right..it would expand and get bigger and contract and get smaller..than dissapear and reapear in a different spot..all the other clouds were not doing this.wich made me very suspicios..i yelled out look at that ..what is that? Im not sure who all was looking at it for i could not take my eyes away..it was a darker colored small cloud that seemed to be ...im not sure i cant explain it ..like steam coming from an invisible ship..and than it took a turn and like a mirage or like when you see heat rising of a car hood it appeared a black triangle .."huge" i mean BIG..
and it seemed as though it was turned at anangle just right for a second and you could see it..im not sure .how to express what i saw that day..it has changed my life ..
i am absolutely terrified..it was not of this earth i am sure of that...the whole time it was silent ..emiting no noise at all..shortly after that a black helicopter wich i think was armed flew into that direction..
Date is approximate.  We have assigned an arbitrary date, which will cause the incident to sort to "about four years ago."  PD