"His magic in it's current state is still very new, so I'm sure the limits are still mostly untested." Because Syrlya doesn't believe it starts and ends there. That's like saying fire isn't at risk of burning you, as far as he's concerned.

He glances aside to Lavellan as he continues. "We were discussing the possibility of using one another's magic directly. This is a replication, rather than the actual thing--" he waves the bloodstone slightly. "So I do not know precisely how it will react to other forms of magic, if it matters at all."

It's as much a warning as an explanation. He has no idea how replica bloodstone is going to respond. "In Tyria, magic is an external energy anyone can access and manipulate it. You are most familiar with mine, which is Mesmer magic."