Well, we’ve seen some of it. In that episode, where Alec came up to find Jace, and he’s on the rooftop, and Jace is kind of just broken. We’re seeing the innate ability between Jace and Alec to just completely rely on each other. No words necessarily need to be spoken, just that embrace of your best friend or your soul mate. That contact of someone saying, “I’m here; I will look after you.”