Normaly I think they cannot interact much with the physical world. They need to use visions and such to enter or influence people in their dream state. But right now it appears they can interact with the physical world. So hopefully the demons were sent packing.
Most communication is mental, their thoughts can interact with ours any time we let them and times when we don’t let them.Sr. Steven Greer interacts with them on a regular basis and has for years,hes a brilliant guy,it takes lots of practice but its doable.It’s called close encounters of the fifth kind when we initiate interaction with them.