Boruto tries to avoid it knowing he'll get low diffed and says when we get home.
Sarada's not having it and says let's do it here.
Boruto's scared and trying to move it till he gets home.
Sarada says let settle it here.
So in other words Sarada was ready to stomp him, Boruto knew he'd get stomped, couple his stalling with his earlier admittance that Sarada can kill him. His rash let's throw down attitude went out of the window knowing the result of what would happen to him.
Even he knows Sarada Solos him, Yet some of his fans are in denial.