Overlaid object via tracking won't go off-screen

Hey folks, got a little issue here, the situation goes as follows:

I tracked an object a person is holding in a hand in Mocha, tracking went great. Then I pasted the tracking data into a null object in After Effects, positioned and linked an image to the tracker data, and played the preview. It works flawlessly until the moment the object is supposed to go off-screen... then the image just kind of hits the corner of the video as if it hit some kind of wall and just hangs there until the end of the clip.

Does anyone know what I'm doing wrong and how to fix this?

Thanks!