He hadn't interacted with many people who also possessed super speed, so when Tommy was able to move the phone of his reach it was a bit startling to Pietro. Still he managed to recover, and stop the younger speedster from dialing Wanda. Just able to stop the younger speedster.
Pietro kept the phone in one hand, and looked at the screaming child. Then he looked back to Tommy and held up the phone. "Who do you know who has children?"
They couldn't bother Wanda but Pietro was fine with bothering someone else. "Call them, and I'll go and retrieve them."