There was a similar incident in my mind last week at GP. The horse on the inside came out a bit in nudged the horse on the outside, the outside horse then leaned back on the inside horse and caused him to check badly. I don't think the outside horse necessarily impedes the inside horse until he comes out and makes the first contact. They did the DQ the outside horse last week. This week the inside horse came out with Irad and forced the outside horse out at another lane. The outside horse did come back inside a bit but not until after the first contact was made and certainly not to the same degree. I was surprised they did not move him down.