Do non-submunition warheads separate from the rocket in the air? Because rockets are 3m long, and I don't think they'd just disappear after the warhead explosion. In other videos you could see rocket bodies sticking from the pavement after impact, etc.

Anyway, I guess you're right. Even if this was edge of the killing field with a mix of submunitions from various rockets fired at different times, there's be a lot of noise in the video from the other submunitions hitting nearby.