this is in the official onepocket.org rules
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6.8 Close proximity shots — foul criteria: Close proximity shots often come up in One Pocket with no referee available. When stroking towards a ball in close proximity to the cue ball, a double hit foul is indicated when the cue ball is driven immediately forward through the contact point, or immediately forward through the carom tangent line, without first exhibiting the pause and accelerate action of legal follow or draw. This foul criteria applies whether stroking with an elevated cue or not. With advanced skill, it is possible to play close proximity shots without committing these common double hit fouls. Alternatively, players may agree that shooting away at a sufficiently thin angle reasonably avoids a
double hit. A ball declared frozen to the cue ball may be legally stroked through.