CAS turned on the class in a second half that saw the Giants wilt in an alarming manner.
Having come out of the blocks like Usain Bolt on a mission and taken a 10-point lead, the Giants stayed in contention and at half-time it was a contest that looked impossible to call.
But within six minutes of the restart the Tigers were 16 points in front and they never looked like surrendering their lead.
The Giants did not make life easy for themselves as a string of unforced errors saw them throw away possession and put themselves under pressure.
And perhaps the most stunning problem they had was getting anything from their kicking game.
Admittedly a swirling wind was not making life easy for the likes of Danny Brough and Brett Hodgson, but such instances as two kicks going directly into touch, a penalty to touch actually losing ground and a drop-out not travelling the required yardage saw the Giants hand the advantage to their rivals when they could ill-afford to.
The visitors were also not helped by the first-half loss of prop Keith Mason to injury and from that point on Cas had a shade too much power for them to handle.
However, Cas had their problems too, with players missing through injury and the late removal of former Giant Stuart Jones from their line-up due to a virus.
Certainly it was the Tigers who were feeling sick after the first 10 minutes as they were stunned by Huddersfield’s storming start.
The Giants were ahead after just two minutes as Leroy Cudjoe collected Kevin Brown’s astute kick to the corner and Brett Hodgson added the goal – it was to be his only successful shot of the game.
Five minutes later the Giants stretched their lead as the impressive Brown again laid the foundations and his vision created the path for Jamahl Lolesi to touchdown.
The Tigers were looking pretty tame, but the influence of half-back Rangi Chase began to tell and after a spell of pressure they got on the board as prop Craig Huby got over for the first of two tries and the sure-footed Joe Westerman added the goal – the first of six from six attempts.
Two minutes later the home side were ahead as Giants winger David Hodgson endured a nightmare moment.
A long and seemingly innocuous kick went over his head but his first attempt to collect the bouncing ball saw him fumble.
The Tigers moved into to apply the heat and Hodgson failed to control the loose ball which left Chase to pounce and level the scores and Westerman’s kick put Cas in front.
The game was looking well-balanced and the advantage tipped the way of the Giants on 24 minutes when Brown again was at the heart of matters and Brett Hodgson gave the telling pass that led to Shaun Lunt scoring.
As half-time approached Larne Patrick began to make a big impact but after a 60m foot race having been released by Luke Robinson, he was held over the line and just five minutes later the same fate befell the Giants substitute as he tried to get over from much closer range.
So it was a kick in the teeth when on the stroke of half-time the Tigers got ahead once more as Dean Widders made the most of a kick-through and former Giant Steve Snitch powered over the line.
Buoyed by that score the Tigers came out roaring for the second period and within six minutes full-back Ryan McGoldrick and Huby had added to their tally, with Westerman’s goals pretty much putting the home side out of sight.
For all their efforts, the Giants could not break the resolute Tigers defence and, as frustration grew, so did the number of errors and Cas began to look comfortable.
They pulled further ahead midway through the half through winger Kirk Dixon and though Lunt made the most of some excellent creative work by Robinson to reply, Cas finished in style.
As the game wound down Dixon added the first of his two goals as the Giants conceded a silly penalty for failing to drop-out correctly and he then tagged on the goal with the hooter having blown after Chase had intercepted and raced more than half the length of the pitch to score.
The win pushed Cas firmly into the play-off frame, while the Giants slipped further away from earning a home draw in the end-of-season play-offs and Huddersfield will need to get back on track quickly against Crusaders next Sunday.Related content