Ok, we're referencing the same video. At what seconds do you detect rapid vertical acceleration? Here's the link again... Leyvas video. If it was in the first 4 seconds, keep in mind that the same video segment is repeated at 30 seconds. Since there are actually other objects in that portion of video to compare relative motion, it should be easy to detect the movement of a missile moving vertically at several times the speed of sound. I'm just not seeing it. If your explanation for the lack of apparent upward movement is that the missile was already heading northwest bound, it must have started arcing very early in its boost phase. The problem is, at 14 seconds and 27 seconds, the trail is much longer than in the first 4 and 30 seconds. So if you believe the missile is arcing away from the camera to such an extent that it no longer appears to be "climbing" in the video (no visible relative upward movement), it is difficult to explain how the trail is significantly "taller" in subsequent pieces of video. Furthermore, if it is climbing into the stratosphere, toward the sun (which set at 4:54 and Leyvas said he started filming at 5:15), the trail would become white as it was hit by direct sunlight. That never happens.
I don't know how much video Leyvas shot either. But I do know that of the 52 seconds we are looking at, well more than half is actually the same pieces of video shown more than once. And the pieces shown the most show no relative movement of the object making the trail, even at the earliest stages of its appearance. Finally, if Leyvas did in fact watch a plume generating object for 10 minutes, there is no way he was watching a missile. Not even the space shuttle burns that long.
http://www.freerepublic.com/focus/f-news/2630024/posts?page=1#1
http://www.freerepublic.com/focus/f-news/2630024/posts?page=21#21
and
http://www.freerepublic.com/focus/f-news/2630024/posts?page=34#34
Especially #21...
Look at he contrail in all frames relative to that "forked" cloud to determine "what came first"...
The sun in the Winter sets to South Southwest. This time of year it would not strongly backlight the plume. We would expect to see exactly what we saw.