Was going eastward on my way home and i always pay attention to the sky at nite as,i once saw a black triangle to the east of the sky several years ago; and in that particular side of the sky there is always some helicopter activity due to the freeway or crimes in the area.I noticed that one "starlike white light or helicopter was approaching the other '" white starlike" object, and then suddenly the starlike object that was stationary took off with amazing speed and ascent, and the second white light or helicopter in pursuit ,but it could'nt catch up with the other bright light and then it disappeared into the sky.I waited to see if the local news had any reports ,but i did'nt hear any news at all about this incident,and i did'nt report it to any authorities as i don't think they would take me seriously.This wa so amazing and scary,i've never seen anything take off so fast ,like it knew it was being found out.And this was pretty high in the sky as both objects resembled stars.