3 Cigar Shaped Craft, form a Triangle formation higher in sky, then moved apart and flew off below the treeline horizon with no sound

I am listing this for my friend that saw this while driving home from a trip. I am a professional ufologist. He was driving west on US 155, Cass County, Texas. He was 10 miles before Lake O' The Pines around 5:30 in the afternoon. He pulled over with his window down to take the pictures. When he first spotted them they were higher in the sky, and in a loose triangular formation. They maintained the same cigar/cloud-like shape even when they moved. They left the formation and made a somewhat straight line, before moving off quickly to the southwest below the treeline horizon where he lost sight of them. There was no sound that could be heard.