I had a situation where a player cast the shield spell after being hit while blinded. RAW this seems fine, but I feel like the spell should probably read “an attack you can see”. Thoughts? I could see that – I'd be sure to let players know ahead of time about that, though, since it does change the spell functionality.
— Mike Mearls (@mikemearls) October 31, 2018
With RAW I would let the shield trigger but either not for this hit or this hit at 1/2 damage to reflect the blindness. Would either sound like ROI?