3. Justin Bieber can sing even when in a tight situation like that!(in reality, there wasn't even a slight gasp or even a short delay in his singing, I want you to try singing perfectly while getting knocked over. Though, I give him credit for his quick recovery to fool the fans.)
I'm pretty sure he's been proven lip-syncing in the past.
How can one continue singing when they were never singing in the first place?
Playback is such bullstuff.