There was a good ten minutes before any response was forthcoming, primarily because Hiro had heard the message but hadn't pinned down exactly where he'd left his communicator. Judging from the background noise that would come through clearly on the device, he'd been in the middle of some sort of major manufacturing operation. Which, of course, he was as per usual.
The hiss of the propellant in his jetpack was also apparent. There was no reason for him to quit working, he oversaw the automated portions of the construction process of his latest mech.
"Nah, I've just been busy," the supergenius replied to his teammate, surprisingly cordial for him. He rolled his eyes. "You know, with your mom."
Ah, the wit of a thirteen year old boy. Was it painfully juvenile? Absolutely. He was almost embarrassed to be engaging on the 'your mom' front, but sometimes a guy had to get right down to his arch nemesis's level to really give him an aneurysm.