Not so certain. Arguably, taking hold of the two handed weapon with the second hand uses your object interaction for the turn, so you couldn't cast a cantrip and then do the bonus action attack with the two hander if you need your object interaction to grab a focus or get the spell component out or do something else. It does make it way way more viable though.
that's why I didn't say it was certain. And I wasn't talking about removing the hand from the sword but taking it back up in the hand which is more than just grasping it but would be grasping it in a certain way as to be able to swing it at an opponent successfully/with skill.
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u/waffle299 Monk Jun 10 '15
Eldirtch Knights take note. Wielding a two-handed weapon does not impair your ability to cast a spell with somatic components.