Brighton Blues came from eight points down to beat Horsham 31-22 at Waterhall.
But the match ended amid concern as Horsham lock Jacob Denhart was treated for injury.
Full-time was blown on 71 minutes and the result stands.
Horsham director of rugby Nick Stocker said: “Thankfully he is fine and now going through the concussion protocols and we’d like to thank Brighton and their medical team for their support in managing his treatment on pitch.”
Tyrone Makasi, Ollie Simpson, Will Hoare and Ross Miller (2) scored tries for Brighton.
Tom Whittaker, George Howard and Tom Sanders touched down for Horsham.
Horsham felt they wasted chances to add to their points tally and that Blues were the more clinical side.
The two teams have a tradition of good rivalry but were relegated together at the end of last season.
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