Dani Ceballos' injury-time strike saw Arsenal squeeze past Sheffield United 2-1 in their FA Cup quarter-final clash at Bramall Lane on Sunday
Nicolas Pepe's first-half penalty appeared to have sent the visitors to Wembley - the forward's eighth goal of the season - only for David McGoldrick to stab home an equaliser with just three minutes left to play
However, with extra time seemingly beckoning, Ceballos found himself in the right place to finish off an Arsenal counterattack with a neatly taken goal that keeps his side's season alive as they progressed to the semi-finals of the competition for a record-equalling 30th time
The Blades, though, have still to win since they returned to action three games ago and must now concentrate on trying to secure a place in Europe next season via their Premier League placing
Ninety-eight days after the two teams were originally due to meet in the last eight of the FA Cup, they finally did in a tie of huge significance for both clubs
Despite not having their usual vociferous home support to drive them on, the Blades still began on the front foot against opponents with David Luiz back after his recent suspension, but with top scorer Pierre-Emerick Aubameyang only a substitute
Chris Wilder and his players thought they had gone ahead after just nine minutes when John Lundstram nodded home Oli McBurnie's own header back across the six-yard box following a left-wing corner
However, the Video Assistant Referee was on hand to correctly deem the defender offside and so it was Arsenal who actually went in ahead at half-time thanks to Pepe's calmly dispatched penalty correctly awarded after Chris Basham caught Alexandre Lacazette in the box
It was a different Blades team in the second period, though, no doubt driven on by some stern words from their manager, who watched another 'goal' by John Egan ruled out for offside after McGoldrick had just gone too early at a free-kick
The hosts kept pushing, however, and got their rewards when some slapstick Arsenal defending saw Sead Kolasinac's late clearance hit Rob Holding and fall straight at McGoldrick's feet, and the forward could not miss
But if Sheffield United thought they had done enough to force extra time, they were wrong as Arsenal launched one last break up field that ended with Ceballos jinking his way into the area and somehow sliding a low shot past Henderson at his near post for his first goal for the club
It is fair to say the left back has endured a stop-start nature to his Arsenal career after his big-money move from Celtic last summer, interrupted first by a double hernia he underwent before arriving at the Emirates and then after suffering a dislocated shoulder against West Ham last October
However, since returning to the starting XI, the Scotland international has shown just why the Gunners were so keen to bring him south of the border and his display against the Blades was further proof of his eye-catching abilities
The 23-year-old was rock solid in the visitors' five-man back line, as well as providing a constant attacking outlet down the left with his surging runs, and was unlucky not to create a second first-half goal for Pepe after another such foray
And what is more, it was his pass that led to the foul on Lacazette for Arsenal's crucial opening penalty that sent them on their way to victory
"I had complete belief we would get back into the game
 I thought we dominated the game in the second half and missed the best chances, and I thought we would have another chance to win it
 A couple of boys are just a bit short of belief but there are certainly encouraging signs from our point of view
" "I am really pleased
 It is a really tough place to come and we got the result we wanted
 We fought right until the end and I really liked the attitude of the team
"They are really good at what they do
 They put you under pressure all the time with their direct play
 They put you in trouble
 We dealt with that really well but you know at some stage you are going to suffer
 We did but the reaction straight away was really good
"The Blades are back in Premier League action when they face Tottenham at Bramall Lane on Thursday, a match you can see live on Arsenal, meanwhile, take on struggling Norwich on Wednesday, with both games kicking off at 6pm
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