Quickly retreat from melee without provoking attacks.
Roll 1d100 against DR 100.
Or opposed roll against closing and similar.
If successful, you move out of melee range without provoking a readtion such as Attack of Opportunity.
If failed, you stay in melee range and opponent can react to your engage and gain your failure rate as a bonus to the reaction (not directly to an attack).
Standard combat modifiers
You are surrounded by two enemies. You use Disengage, beating DR 100. You slip past one who stays, but the second chooses to follow with closing, triggering an opposed roll.
You attempt to Disengage from an opponent with a long spear, who uses spring attack to counter. You can choose to be attacked or disengage again with a combat modifier for repeated use of skill (+25 to DR)
Disengage is the fundamental skill for breaking away from melee engagements. Whether dodging a sword, ducking under a spear thrust, or simply creating distance, the Disengage skill allows you to avoid the automatic threat of retaliation that comes with leaving combat range. It is particularly effective against enemies with short weapons or when allies distract or pressure your opponent.
Unlike retreating normally, using Disengage avoids triggering automatic attacks - if successful. The skill becomes part of tactical positioning and can be essential for ranged or vulnerable characters needing breathing room.
Disengage (1 AP) + Dash (1AP) or Tumble (1 AP) = You disengage and immediately follow up to move further away preventing a counter from closing for example.
Closing, Spring attack and similar can lead to opposed roll, or a series of reactions (disenga, closing, disengage, closing, disengage...)
Attack of Opportunity if the disengage fails.