The part for the touching of an ineligible player. The touch has to be intentional by the ineligible player. He threw the ball at the lineman. The lineman didn't try to catch it, therefore it's not illegal touching.
No it does not have to be intentional for it to be illegal touching all it has to be is for it to hit the ineligible player before it hits anyone else, it should have been either illegal touching or intentional grounding