I remember a few years ago in an A320 sim, I was debriefed on putting the landing gear up on a single engine go around. I was PNF (FO)
GA Executed, Toga applied, however being slow to attain the proper pitch attitude we did not have a positive rate of climb. I was scanning the VSI and one point we actually were hovering around zero/descending a bit. Nothing against the handling pilot though we're all a bit rusty when we jump back in first day after 6 months
Once the proper attitude was attained, we started to climb and I called positive climb, and we retracted the gear etc.
I was asked "why did you delay the positive climb call" and I said because we didn't have a positive rate of climb. The checkie said yeah ok but single engine its inhibiting the performance so the gear needs to come up.
All very interesting!