Intentional trip

[JugglingReferee]

I'd definitely consider flagrant.

If a player intentionally fouls someone when they are in a severe disadvantageous position, and the effect is egregious, they need to be highly accountable for their action(s).

To me, it's an INT at minimum, and something obvious would need to sell me on the flagrant. If a previous foul by this player of a similar nature occurred, or it is clear that his intent was to foul in a way that results in an injury, for starters.