A flashlight still lights up the whole room, even if it’s just pointed at one wall. It’s not like half the room is totally dark, while the other half is totally bright.

Don’t forget that it’d be nighttime after a certain distance, because light can only travel so far distance before it disappears.

…but, did it work?

As usual, this doesn’t actually make any sense. I genuinely wonder if Trump understands anything people around him are even talking about…or if all of his interactions with others, are just a series of Charlie Brown adults "mwa-mwa"ing at him while he struggles to pay attention.