Bollocks he was. He's about 5 yards from the touchline and about 30 yards out, with Squillaci covering, who gets into the area about half a second after Koscielny "pulls back" Ranger, who makes the most of it to say the least.
Even if Koscielny was the last man (which he wasn't) - How was it a goalscoring opportunity? He wouldn't be one on one, and it's 30 yards out.
Still, didn't make a difference and we should have been much better.
Pretty much what DMF said

He was the last man. Ranger and Koscielny were ahead of everyone, Ranger is racing clear and would be one on one had he not been hauled back. He's 30 yards out, but would have run into the open space. Squillaci was on the half way line behind Ranger and Koscielny, so for me it was the correct decision, but as you say it didn't make much difference.