That was confusing and annoying to read, but thank you for proving my point; grammar is important.
The ambassador brought a dragon magician with the sole reason of insuring that no magics were placed upon either dragon. It sure doesn't seem like he would be fine with Alicorn assistance if Spike would like it. Celestia also also said that she would like to help Spike with her magics, and that her interference would piss the dragons off. (in an earlier chapter)