"Cai bedeutet soviel wie "nach unten bringen". Gemeint sind alle Energien, die so gerichtet sind, dass der Gegner direkt zu Boden geht." Silberstorff, 2003, S. 118

Cai is a forward directed thrust such as a well-directed push when our opponent is off balance.

A force delivered by a quick grab and pull, usually of an opponent's writst,
both backward and down. Form movements: Needle at Sea Bottom.

"Tsai: Sometimes called 'inch energy'. Like picking fruit off a tree with a snap of the
wrist. Often on hand will be placed right on top of the other wrist to assist in the power
of this jerking motion. It is not a pull of his wrist but rather a violent jerking fa-jing movement that can knock him out by its violent action upon his head jerking backwards and kinking his brain stem. Again, the power must come from the centre and not only from the arms and hands, and a follow up attack is also necessary."
- Earle Montaigue, Tai Chi 13 Postures, 1998

"Tsoi is where our opponent loses control of his centre of gravity, and we use a technique to disrupt his balance to such an extent that he is uprooted completely from his position. It is something like a strategically placed lever lifting a heavy rock."
- Principles of the Thirteen Tactics