My first GSD did this too. Sweetest dog in the wold until you screwed with her people. She was an AKC obedience dog, no protection training at all.
I think Havoc would do this too. Kayos maybe- if really pushed. Lydi, the pup would run.
No amount of training will change real protection instincts.
URO3,UCD Aleshanee Windridge "Kayos" CD,TDX,RE,CGC,HIC,TC
PTE,AG2,AN,URO3,UCD Xtra!Xtra! V TeMar "Havoc" CDX,GN,RE,CGC,HIC,TC,BH
UACH,URO1 Tidmores Rising Star Lydia "Mayhem" CD,BN,AX,OAJ,NF,RE,HT,TC,CGC,
Lucky, Wolf, Max