Ultron's not helping because, well, have you met him? He's far too selfish to consider the needs of anyone else. Of course, as he passes by and sees Tony, he stops dead in his tracks. Ultron looks pretty bad off, still in the last sentinel body. He's only just started work to repair it and find supplies for a new one.

"Oh no. Not you too." Why do all the Avengers keep getting pulled here? It's like a conspiracy against him or something. Of course, the others were nothing compared to having his father pulled here. This place must have a sense of humor to put the two of them in close quarters together.