“In a moment when Pinkie gets trapped in a mountain-pile of rocks and is in danger of a boulder falling and crushing her flat, the rest of the Mane 6 do nothing but stand by and scream warnings to Pinkie. Granted, they do start running to save her alongside Maud they simply stop because they’re so dumbfounded by how much faster Maud is but it’s easy to miss, and one can’t help but notice how they didn’t try to save her sooner.”
 
Seems Twilight is learning from her mentor.