I have to agree with Pride the Preobraz make multiple lines with their "Formations". We did NWL and recently another 1v1 where they employed the same tactics but as far as I know, when the line starts moving reloads must be cut. I actually said that it should not be allowed to Ndreval on steam as well.
Brots can you clarify what is allowed?
According to the rules
1b. Movement ONLY in formation.
1b.1 A formation is a tight line, with gaps tightly closed when standing, and with gaps not bigger than 2 men average while moving.
1b.2 Charge movements only in reasonable distances - a charge does not require any formation.
1b.3 A referee can insist on closing gaps in lines that are moving with too big gaps between their men.
Letting your men reload while a portion of your line is moving is ok, but not if they keep reloading while the line is moving
away. For example: The rear five men of your line are reloading, and you decide to move. You can overtake these reloading men and they can keep reloading - but if the line passed these men, they have to keep up with it. They are not allowed to create a gap.