The four; Raphael, Leonardo, Donatello, and Michelangelo had just yet again stopped the foot from stealing something valuable from a museum. It'd become routine but it still made them proud every time, and of course they were bragging to each other about it as they made their way to the manhole. Leo was walking backwards and making huge gestures not being careful of staying quiet though to be fair nobody else was either. "And then I portal chopped one-" he started but Donnie interrupted. "don't get ahead of yourself 'Nardo, none of this would have been possible had my tech not tracked them and then mapped out the building!" Mikey was blabbering so fast it was inchorent to Raph about his fighting as well. Raph hadn't bragged yet mostly because he was listening to Mikey.
The big point was nobody was paying attention to their surrounding where curious eyes might be watching.