Patrick Mangan's bravery paid dividends for Conna Cross in the Graun Hill Suite - Perfect For Parties Beginners Chase at Tramore.
Castlewhite led and with only Leader's Cross and Conna Cross within striking distance at the penultimate obstacle, and both under pressure, seemed the likely winner.
However, he moved away from the inside ever so slightly heading to the last and Mangan seized the initiative, driving Conna Cross (6-1) through it, and he landed running to help seal a two-and-three-quarter-length verdict.
Favourite-backers knew their fate around halfway when Double Island was pulled up sharply.
Winning trainer Jimmy Mangan said: "That race was made for him really and it was a grand introduction for him to fences with a handy field.
"You could always see in his hurdle races that he was going to be a chaser but we won't get excited over that and will take small steps with him."
The Kings Baby benefited from an enterprising Donal McInerney ride to claim top honours in the Waterford & Tramore Racecourse Supporters Club Maiden Hurdle.
The 5-2 chance was allowed to bowl along at the head of affairs and established a clear advantage that never looked like being eroded from some way out, with 10 lengths the margin back to runner-up Aherlow at the line.
The triumph ended a barren spell for trainer Moses McCabe, who said: "That was a long time coming!
"She was unlucky the last day and we gave her a break then. We thought she might need the run today but she was fine and she'll go novice hurdling now and stay in that league.
"It's a long time since I've had a winner, but all the hard work paid off today. She is owned by Mick Kenny from Tinahely, who is a sound owner and a gentleman. Donal gave her a good ride and is a good 7lb claimer."
Mullinavat, a winner over fences here in August, capitalised on a comparatively lenient timber figure by turning the Waterford & Tramore Racecourse Supporters Club Handicap Hurdle into a procession as the 9-10 favourite under Sean Flanagan.
Trainer Henry de Bromhead said: "He got a super ride from Sean, he just went out and rode him like he was the best horse in the race, and that was it.
"He has been busy this season and he is getting near the end of his campaign now. He's in at Fairyhouse on Saturday but I'd imagine that's unlikely - I think we will enjoy today and see after that."
On His Toes hadn't shown much in two outings this campaign but left those a long way behind to take the Waterford & Tramore Racecourse (Ladies Pro/Am) Flat Race at odds of 6-1.