foul tip(sharp & direct)

[hahnhdwe]

trying to find in my ASA book where it says Sharp. In the definitions It says
" a batted ball that goes directly from the bat, not higher then the batters head, to the catcher's hand(s) or glove and is leagally caught by the catcher."

Does direct mean it must be sharp and not have any curvature in flight. I do SP games and sometimes the foul may go nose high and the catcher can catch this clean. Is this a courtesy foul as allowed or a foul tip?