Did Osiris make roots grow out of Anubis' mouth because he kissed Seth?
no. his mouth was stitched shut so his soul wouldnt run away or sum :
Seth did say he thought that the "kiss" was the reason, when he saw those roots (unlike the roots on his head, which are meant to keep him amnesiac, as in, not remembering his past)
its not falling, should have be named gravity devil
Not to many people are afraid of gravity. Also it's most likely a fear of falling from high up, so she has to make them go high up.
what do you think happens after they go super high up
it makes sense
Did Osiris make roots grow out of Anubis' mouth because he kissed Seth?
no. his mouth was stitched shut so his soul wouldnt run away or sum :
Seth did say he thought that the "kiss" was the reason, when he saw those roots (unlike the roots on his head, which are meant to keep him amnesiac, as in, not remembering his past)