Went from hovering to 70+mph to complete stop w/o accelerating or decelerating.I went outside for fireworks and saw one that wasn't exploding. It was just sitting still in the sky and not moving. Then it changed color and moved in a triangular pattern at 70+mph without accelerating and it made a sudden stop without decelerating. It changed the light color multiple time and went out occasionally. It was followed by a larger object that circled the 2 smaller ones.((NUFORC Note: Source of the report elects to remain anonymous; provides no contact information. PD))