You answered your own question...You didn't get a scratch. The control unit is programed with many thresholds. All of them must be met so the bags will go off.
Your car didn't deem it necessary to blow the bags, and you are OK. The energy absorbtion of the body and chasis of the car was enough.
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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope

1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
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PARTNER IN MERCEDESSHOP.COM