Swansea lead 1-0 at the break at Craven Cottage. Danny Graham got the goal in the 19th minute, after Nathan Dyer's shot was parried.
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It was a stupid moment of madness that went terribly wrong, said the victim.
An inquest hears the "excess" chewing of gum may have played its part in the death of a 19-year-old.
A minute's silence will be held across rugby league this weekend as a mark of respect for Keighley's Wales international Danny Jones.