Ultear's too far to have any sort of affect on that match. This is a a phenomanal display of illusionary magic if even Mavis, who is dead, is fooled...
Unless she's not, and she's giving Erza a head's-up on how best to dispel the illusion, along with Jelly.
...y'know, that might be the only way I'd accept him - if he becomes Mavis's eternal lapdog.
