Remember how when Louis turned Madeleine in IWTV season 2 he saw all of these memories from her mortal life, and then eventually he saw Claudia in those memories; and seeing Claudia from Madeline’s loving perspective was this very profound emotional experience for him?
So now, imagine you're turning someone you’ve known for a very long time.* You see flashes of their life from their perspective, not your perspective or an outsider's perspective, including parts of their life that you were around for and parts that even involve you... again, from their point-of-view. Whether those are bad memories or good memories, that would potentially be really painful and unsettling.
And then imagine that as fast as you’ve received that information it goes away. No more getting into their head. You can’t clarify or investigate further. Your access is revoked. Because of you.
Anyway, that's why I think Armand ran after turning Daniel.