Tarmo Tammaru wrote:
there would be no other explanation for standing waves,

May I suggest that you consider charge.
Consider how static charge can store energy in the capacitance of the
line.
Consider how moving charge can store energy in the inductance of the
line.
Consider how the charge moves to change the energy distribution within
the line.
Do it for a pulse of charge; then for multiple pulses.
Consider what happens when the pulses collide; consider pulses of the
same polarity and different.
Do it for a step of charge; then make the step so long it looks like DC.
Do it for sinusoids.
Do it for opens, shorts and terminated lines.
Do it for matched, unmatched and disconnected sources (disconnect just
after injecting the pulse, step or sinusoid).
Do it for sources at both ends of the lines.

And soon you will have an explanation which does not require waves
travelling up and down the line to explain the observed voltages and
currents of the standing 'wave'.

....Keith