tactical rule

Not true! The boy(s) you're currently smootching can't call for reinforcements. Cheque m8

Not true

If the spells they're trying to cast require verbal components they can't cast them.

If you make it a sloppy make out session and pin their hands they can't cast spells that use their hands either.

It's more effective than counter spell.

Edit: Spleling

do i get style points if i do it like in ultrakill

It doesn't give you disadvantage either