One thing to note: neck rolling also "catches" one hit from Ralf's tackle, but because the tackle is practically unbeatable, Heidern just flies right off of him... Even the super doesn't work on the tackle...
Plus, in the corner from charge b~f + A/C, you can hit them in mid air with a standing A, or you can connect either DM if you input the move right after the projectile hits. It doesn't matter whether or not the move is a counter hit, or a normal hit, it should still connect...