They paid the price when German centre-mid Jerome Polenz scored from about 25m out, although Phoenix goalkeeper Glenn Moss appeared to be unsighted with No5 Michael Beauchamp in the way when the ball snuck underneath him for a 1-0 lead in the 15th minute following a cornerkick clearance.
"Actually we didn't intend to start with a defensive mindset," Merrick said yesterday, just before the Phoenix boarded their flight from Sydney.
If anything, the visitors were drowning in the sea of red fans who incredibly chanted and sang for the entire 94 minutes but ritualistically turned their backs on the game.
The Scottish coach reacted adroitly, substituting left wing Stein Huysegems, injecting Jason Hicks in the engine room in the 31st minute and, more purposefully perhaps, planting Paul Ifill on the wing to inject peripheral vision.
"Paul Ifill made a big difference and almost scored a goal himself," Merrick said, before the Phoenix historically host the Newcastle Jets at McLean Park, Napier, from 5pm on Sunday.
In the 58th minute, Wanderers keeper Ante Covic vented his spleen after making two heart-stopping saves following a Carlos Hernandez cornerkick, including the second attempt from Ifill at almost point-blank range.
Two minutes later, it was despair for Covic as Jeremy Brockie, sliding through past two defenders, finished off a deft cross from Ifill on the right flank for the equaliser in the 60th minute to momentarily stun the near-capacity crowd into silence.
Effectively, the Phoenix succeeded in adopting the Wanderers' style of play to turn the tide.
In the changing sheds at halftime, Merrick had impressed on his troops the urgency to create more opportunities on the right flank.
"We were losing it in the left flank and sitting back, letting them come at us so we were lucky not to be down by two to three goals at halftime."
He complimented his Beefeaters, captain Andrew Durante, fellow centreback Ben Sigmund, rightback Leo Bertos and keeper Moss before the second-half ascendancy.
Australian Caira, he said, was only 20 years old and learning.
"My track record shows with the Melbourne Victory that I encourage a more attacking style of play."