DOG warning

[Sharpshooternes]

I was trail on a throw in on the end line. Team A was making a throw in opposite side of the lane from where I was. A2 was on the nearest lane line from me and moving from FT line toward endline. B2 is defending A2. A2 stops quickly near the end line and B2 overruns her and runs out of bounds, both feet but quickly returns. Is this a delay of Game warning, as it happened 10-15 feet away from where the ball was being inbounded from? I think the letter of the rule is yes but the spirit of the law is no. Your comments and opinions would be appreciated.
Thanks.