Richard Clark wrote:
"Where does he (Terman) equate phase with direction?"

From page 90 of Terman`s 1955 edition:
Bottom of the page; "Transmission Line with Short-circuited Load.
Where the load end of the line is short-circuited, that is ZL=0,
reference to Eq.(4-14) shows the reflection coeficient has a value of
-1.0 on an angle of 0-deg. = +1.0 on an angle of 180-deg. As in the
open-circuited case, the reflected wave has an amplitude equal to the
amplitude of the incident wave. However, the reflection takes place with
reversal in phase of voltage and without change in phase of the
current."

I`m a lousy typist but tried to make an exact copy of part of the page.
I assume you agree the incident and reflected waves travel in opposite
directions in Terman`s example.

Best regards, Richard Harrison, KB5WZI