Cripple is not reflected back to the caster by spell reflection while spell immune
Lotus Orb is supposed to reflect projectile-based spells, even when the original caster is spell immune. The projectile would then fizzle (or apply its AoE effect if it has one) on them when still spell immune on impact, but would fully affect them if the immunity wears off before impact. But Rod of Atos' Cripple does not follow this rule. Instead, it does not get reflected at all.
Other spells with this bug are Hurl Boulder
, Adaptive Strike
and Mud Golem
's Hurl Boulder