Darius recast on same target, simple indication that could work
im talking about this idea if you're wondering http://www.reddit.com/r/leagueoflegends/comments/2ahi1m/a_change_for_darius_that_could_make_him_feel_like/
Idk if you guys even saw or are considering this idea but I think It would be simple to just making a debuff on the target ulted and darius.
example, cho got ulted, cho could have a buff with a timer on it saying" you have been dunked recently and cannot be redunk for X time/sec.
and Darius could have a debuff thingy with the icon of the dunked champ,
have been dunked recently and cannot be dunked again for X time/sec.