This incidentally proves the hauling theory, as when a rod and line
are attached to a fence post, a haul does not accelerate the line, but
it increases tension massively. This explains why even a small fast
haul increases line momentum very considerably. There has always been
very considerable controversy about this, some maintaining that the
haul increases rod loading ( it does to some extent), and other
maintaining that the line was accelerated. The line is accelerated to
some extent, but the primary factor is line tension.

Without the tension the line can not be accelerated, the greater the
tension, the greater the acceleration.

Imagine the traces of a dog sled. Before the sled can move, the traces
must be taut, ( = under tension), the greater the tension, the greater
the force on the sled, and the faster it moves. It is also necessary
to increase tension constantly in order to mainatin or increase it,
which further proves the theory, as this is also the ideal casting
stroke.

TL
MC