I think he just meant that from %50 in advance, if you hold down the button lightly for 1-2 seconds it will go back to the first stage in advance mode (100%).
Actually I meant that anywhere within either basic mode or between 5-80% in advanced mode, holding down the switch softly for 1-2 seconds returns the light to the default setting
within that mode. So whether you are at 20% or 50%, pressing softly and releasing resets it to default, i.e. 100%. In basic mode, this would mean the medium setting.
However, if you happen to be in low setting (basic mode), this action will send you to advanced mode (same as a hard click). Or if the light is in the standby, SOS, slow strobe setting or above 80% (advanced mode), the same action will switch the light to basic mode.
I guess this light is not for the faint of heart, as it can be quite complicated to memorize all those quirks.