With the momentum, Cushing opted to make a double change at the break, introducing Moralez and Mitja Ilenič – and later, Mounsef Bakrar, Andres Perea, and Jovan Mijatović.
Chasing a quickfire second, the home side laid siege to the Philadelphia goal, but could not make their pressure count.
O’Toole and Tanasijević both saw efforts bounce wide, while Rodríguez’s strike from distance was saved.
Ilenič then forced Rick into a fine stop with a fierce drive towards the top corner, before Parks went agonizingly close with an attempt that crashed off the post, after some neat build-up play.
Bakrar was also unfortunate not to have written his name onto the scoresheet, denied twice by Rick in quick succession. The forward did well to nip in and clip the ball over the Philadelphia shot-stopper – who scrambled back to claw the ball away before it bounced in – and the City man would be thwarted again moments later.
The Union netted a fourth to deliver the killer blow with just over 15 minutes to play, courtesy of another set piece, with Glesnes rising highest to power Wagner’s corner into the back of the net.
The frustration would continue for the Boys in Blue, as Moralez watched an acrobatic attempt cannon off the crossbar in response, and Glesnes somehow cleared another Parks effort off the line.
Substitutes Perea and Mijatović also tried their luck to no avail, and the visitors extended their advantage on the counter-attack, as Bueno fired in Philadelphia’s fifth of the night with five minutes to go.