User blog comment:SayuriDarling/The Mark of Athena Official Discussion/@comment-4430596-20121014233445/@comment-4649443-20121019040201

It could go both ways. According to Arachne it's "a very hard fall." BUt Annabeth is extremely intelligent. She might know how to slow a fall, i.e. Use her shirt as a parachute. And if Percy finds even a little water he could control it and make it catch them.