Not five minutes immediately after Ultron is alive (and even ahead of he will get a body), he kills J.A.R.V.I.S. For his part, Tony gets defensive about Ultron as a idea. Wanda lets Tony to choose Loki's scepter, believing he would ruin himself with it since that happened to everybody else whoever touched it. Speedster Pietro is more arms-on in fight, while Wanda relies on her telekinesis.