If you feel you need multiple attempts at Prozac Skip later on, pick up the Chaff Grenades in the locker.
This guide will only focus on the standard strategy for Olga. Please refer to the MGS2 Boss Fight: Olga page for more advanced strategies and information on the fight.
Tap R2 to unequip the M9, then mash Square as Snake attempts to drop down.
If done correctly, this will skip the animation of Snake dropping down a ledge (called a 'davdrop'), saving about 0.8 seconds.
This is unlikely and tricky to do, so its more likely than not that you will not get this.
This guide will only focus on the standard strategy for Guard Rush. Please refer to the MGS2 Boss Fight: Guard Rush page for more advanced strategies and information on the fight.