What actually makes a jump ball?

[Nevadaref]

RULE 4, SECTION 25 HELD BALL
A held ball occurs when:
ART. 1 . . . Opponents have their hands so firmly on the ball that control cannot be obtained without undue roughness.
ART. 2 . . . An opponent places his/her hand(s) on the ball and prevents an airborne player from throwing the ball or releasing it on a try.


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And I'll concur that many officials do make this determination too quickly or in situations when the ball truly is not "held".