[Non-Sequitur]

In the beginning of the clip the missile is all squiggly until it locks on.

Locks on to what?

[eyedigress]

Are you familiar with telemetry....Missiles are launched and make a telemetry correction upon lock then boost again.

[Greysard]

Locks on to what?

Onto an imaginary point in the sky that the missile must reach by (and at) the time the engine turns off.

(not to be read that I support one theory over another here. I know nothing.)