Pretty good - although - to nitpick - thats barbed wire not razor wire. And it wouldn't represent much of an obstacle. Have a look at these:
http://www1.istockphoto.com/file_thumbview_approve/792711/2/istockphoto_792711_razor_wire_defence.jpg
http://www.greatwardifferent.com/Great_War/Fight_for_Antwerp/Fight_03.jpg
http://www.eriding.net/media/photos/warfare/caen_mem/050630_cbrown_mp_his_cm2549.jpg
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