1)
What is "Tigof"?
1.
Rashi: It is to stumble. The same applies to every expression of Negifah.
2.
Radak #1: It is Po'el Omed (the action applies only to the subject), like Tingof.
3.
Radak #2: It is Po'el Yotzei (it acts on others). The Tav is conjugation for second person; they will carry you, lest you knock a rock. This is like "Ki Im Avnei ha'Sadeh Verisecha v'Chayas ha'Sadeh Hashlemah Lach" (Iyov 5:23).
4.
Malbim: [The angels will carry you, lest you have] even a minor bump - any damage at all.
