Richard Harrison wrote:
A virtual short appears in a line with 100% reflection. The virtual
short appears where the sum of incident and reflected waves produces a
concurrence of zero volts and maximum current, just as in a true short.

A physical short causes the voltage to go to zero. If a virtual
short causes the voltage to go to zero, what causes the virtual
short?

The virtual short cannot cause itself so ...

Either the virtual short causes the voltage to go to zero in
which case: What causes the virtual short?

Or the voltage going to zero causes the virtual short in which
case: What caused the voltage to go to zero?
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73, Cecil, W5DXP