Foul tip in the dirt mechanics and help?

[AtlUmpSteve]

Unless it just happened, there is no approved ASA nor NFHS signal; it is the plate umpire's call, and he can get help, if he asks for it.

NCAA had both closed fist (caught) and point down (uncaught) for base umpires until last year (2014 manual?); unfortunately, there were TV games where U1 had one signal and U3 had the other. So, the current mechanic is for the open side umpire only (the one with check swing responsibility) to point down if uncaught only. It's still the plate umpire's primary call, with need to request help before a base umpire should step in.