((In my mind, Fiona's going "woop woop woop!" as she scuttles away 
))
Tranquillina had been watching Fiona, curious to see what her first action was going to be; her actual choice was nowhere on Tranquillina's list of predictions. After a moment of being stunned, she tries to squirm out of the giantess's grasp, which naturally accomplishes exactly nothing. When Fiona finally lets go, she falls with a bump to a sitting position, from which she watches the beginning of the race with a dazed look.
"Well," she says, lifting herself up and patiently smoothing her dress back down. She saunters over to an edge of the landing, catching a glimpse of Fiona spider-prancing across the second switchback down. "Did I advise her to be as fast as possible? I thought I had chosen my words more carefully." The remark is confusing to the other magi until they actually (surprise!) see a small grin and a twinkle in her eye.
Glancing down to rummage patiently through her pouch, she tosses a few words over her shoulder in a slow drawl: "Gerulf, I will be happy to continue this tour when you make your way down the trail. I am enjoying our little outing. And Stultus ... well, a pleasure, as always," she falls back on formula. Her lips form a gently "aha" as she pulls a nondescript flat rock out of the pouch. Straightening up, Tranquillina looks at the two magi; she peers quickly over the edge of the cliff, as if she is considering jumping off of it; and then she winks at them and says simply, "Wish me luck."
Then she casts Leap of Homecoming without a sound or a motion.