Am I at fault?

As I've mentioned, I intern at a theatre in Minneapolis.  Shockingly, it's quite an upscale, well-off joint.  With that comes a massive green room.  I've been attending rehearsals pretty regularly, and so the other day, we were on a ten minute break.  Actors and other artists are milling about and chatting in the green room.  I, since I'm still too awkward and nervous to talk to anyone, keep to myself with a magazine that I pretend to read.  Also, I should mention, since this is a large non-profit theatre, they have a huge volunteer program.  One of the volunteers I see often is an old blind woman who is accompanied by a seeing-eye dog.  Yet, I've often questioned the dog's current credentials, as it always seems to be dragging her around.  Regardless, she enters the green room.  I notice her, but think nothing of it, and go back to my fake-reading.  Suddenly, as she walks by, she bumps right into me.  I, of course, am very startled, and so is the woman, who frightfully apologizes and keeps passing by.  I look up and everyone in the room is giving me the exact same look.  The "What the fuck is wrong with you.  You just got in the way of a blind person" Look.  Now I didn't say this, but I don't think that is my fault.  The dog is leading her; he's her SEEING EYE!  I think the dog dropped the ball.  And if you want to make the argument that a dog can't be held accountable for the very reason that it's just a dog, then why has it been bestowed with the lofty responsibility of a blind woman?!

I don't think I'm at fault.