Section 8: Safety Considerations

Dangerous play (Rule 9.2, 9.8-9.9). Players on the field must hold their stick and never use it dangerously, and must not lift it over the heads of other players.

Source: Rule 9.2, Rule 9.10, Rule 9.13, Rule 2.7, Rule 13.3, Rule 4.4

Send this to your friend — argument over.