Situation: Blue1 in possession of a mobile goal with 6 red rings is trying to place the goal in a negative corner. Red1 pushes Blue1 into the field perimeter with 12 seconds left in the match. They are both trying to get to the negative corner, one to place the goal and one to stop the goal from being placed. Blue1 is not trying to escape, Red1 holds them to stop them from placing the goal. Red1 was warned for pinning they backed away briefly Blue1 did not back away but tried to continue forward to place the goal in the negative corner. Red1 seeing Blue1 was still going for the corner continued to pin Blue1 for the remainder of the match. If Red1 moved back a full tile Blue1 would have been able to place the goal and won the match.
Essentially it is the same stalemate you see in positive corners just in the negative corner. Both robots, I believe, are being defensive. Blue1 is being defensive in trying to descore their opponents rings and Red1 one by trying to stop them.
Should this situation be called for pinning? Is Red1 required to move back a full tile to prove Blue1 is not trying to escape?