T. Foster said:I'm fairly certain (not 100% because I don't currently have the books in front of me to check, but about 95%) that there's a mention somewhere in the 1E AD&D rulebooks that a party that achieves surprise can choose to avoid an encounter entirely (slip back around the corner, close the door, etc.) in lieu of taking free attacks. And, honestly, even if its not in there, or not worded in that exact way, it's still within the spirit of the rules and the purview of the DM's judgment.
I don't have my books in front of me either, but I was just reading my 1E DMG last night and it does indeed say that.