Assertion: table tennis's umpire | /r/CapableOf | warn the server
Facets:
Source sentences:
text: If either the umpire or the assistant umpire is not sure about the legality of a service he may, on the first occasion in a match, interrupt play and warn the server; but any subsequent service by that player or his doubles partner which is not clearly legal shall be considered incorrect.
text: If either the umpire or the assistant umpire is not sure about the legality of a service he may, on the first occasion in a match, interrupt play and warn the server; but any subsequent service by that player or his doubles partner which is not clearly legal shall be considered incorrect.