I tell this peer to send out an e-mail detailing the technical scenarios with which he is facing difficulties currently, just so to keep everybody in loop.
I told him to send it out yesterday, he didn't. So I went to him again this afternoon during the lunch break and said 'It need not be perfect, it's only within the team. That way, it will give time for other to digest and respond. And if they don't, you have an upper hand in the status meetings. So no matter what, send it out.'
He walks up to me in the evening, just before as I was leaving and asks ' What should the subject line be ?'