Big Punch is very much broken in Titanfall, as it lets you scale objects and fly with Titans or even with your Pilot at times. If you continue punching, the Titan can sometimes lift off the ground and start flying straight into the orbit—as it can be seen in the GIFs below.
It's a silly bug that can work on some spots and maps, hopefully Respawn fixes this bug soon enough.
Needless to say, it allows you to defy the laws of gravity and get to places where you shouldn’t normally be able to go—and that’s unfair to everyone else in the game.
It's not shown in the GIF but a similar problem occurs when you melee at a pilot, the lock on animation forces you to collide with walls and launches you in the air.