You have an interesting take on gravitational physics. I was not aware that the sun wielded a ball bat to "smack" anything with. IF that were so, then by your theory of physics implicit in your use of the word 'smack', the sun magically imparted some other form of energy not related to gravitational 'slingshot' affect or tidal forces. Even if the sun could smack the comet with your theoretical ball bat, it must also of necessity then be able to apply that smack in a somehow off axis path so as to impart some other 'direction' (ok.. angular momentum) to the resultant remnants from the flogging it gives the comet.
This postulation must be accepted as a tenet of faith on your part to allow thinking that the remnants of the smacked comet would disperse in a manner contrary to standard laws of physics.
Of course, while on the back side of the sun and unseen by us, Ison could have been manipulated by Zetans, Theatans, or Sleestacks or collided with Nibiru so as to impart widely divergent from standard Newtonian motion trajectories to these parts... If this is your position, then of course standard physical models fail. And you have a great deal of faith.
Unless you are willing to allow for an interjection of off-axis energy to the Ison 'system', that 'system' WILL maintain its original trajectory... The angular momentun that the 'system' possessed on one side of the sun will be identical on the other side of the sun, you just have to add 'em all up..
M'kay, pay attention. Roche limit passed, gravitational stresses rip apart comet nucleus, pieces of nucleus are give tangential vectors because of being ripped apart, tangential vectors are magnified by being imposed during highest speed of object whipping around sun, magnification of tangentiality is caused by tangential imposition at the very start of the exit path from the sun, pieces of the object maintain statistical mean around original vector away from sun, statistical mean is not affected by spreading cone of tangentially impacted Roche limit destruction derived separation of pieces of nucleus, cone of potentially destructive material continues to expand along original vector away from sun towards Earth.