Originally Posted by
Anggul
That's just talking about the fact that a vehicle would otherwise have to Snap-Fire another of its weapons for each missile fired.
So yes, if a Broadside fires a Seeker Missile using a Markerlight counter it can fire both of its other weapons as normal, but not if it fires it manually without a Markerlight counter.
Also, manually firing a Seeker Missile at a flyer would be BS1, but I believe it's BS5 if you use a Markerlight counter to fire it. You would have to hit with the Markerlight at BS1 first though.