I played Allen Evenson at WCM in Vienna Woods. The key to that scenario skulking-wise is the trench to lower terrain move.
B27.6 provides the rules basis:
Infantry beneath a Trench or Sangar (F8.) counter may move/rout/advance/Withdraw-from-CC directly to any Accessible, non-Crest-status lower-elevation Location without having to first exit to above that trench/sangar. Such a move/rout/advance/CC-Withdrawal in the opposite direction, from a non-Crest-status position to beneath an Accessible higher-elevation trench/sangar, is also allowed if that Infantry unit and trench/sangar are in the same side's OB and/or the unit's side Controls the trench/sangar.
This allows the defender to skulk back off the hilltop in all locations and then advance back up. No more free shots for the SS in the DFPh. This gives the Russians a better chance of slowing the SS down until the reinforcements arrive.