When traveling to cleveland ohio at about 8 to 9 o clock at night, we where traveling on the highway just outside cleveland when we noticed a ch-47 chinook helicopter traveling along side of us at speed. when it had overtaken us on the right side and flown a bit further ahead we noticed a second one off in the distance coming towards us. right when they were within 500 feet of each other a bright blue green orb about the size of a small car suddenly appeared in between them and traveled off to the left in a sudden backwards “z” zig zag motion downwards and blinked out before it reached 50 feet above the ground. it felt as though the ch-47s were traveling with great urgency and the blue green orb was making evasive maneuvers to escape them. once it appeared we felt a quick pang of fear as you would normally feel if something jumped out at you. i have never seen anything of that size move that fast before. i have considered every other plausible explanation for what it was from ball lightening to tracer fire and none of it makes any sense. it was a fairly clear night and the object did not originate at the helicopter but in the middle of the air between them. i have also never seen any tracer fire zig zag like that that fast.