If I had to use it, I'd drop the s. I have to take shelter.I have to take shelters first.
He wasn't with me; he was talking to me on the phone.Do you mean you were talking to him on your mobile phone and were telling him your first priority was getting to a dry place? Or was he with you?
If I had to use it, I'd drop the s. I have to take shelter.
But I think I'd be more likely to say something like: I need to get out of the rain first. I'll take the photos later.
I think you are wrong. All of the dictionaries I checked classed this use as archaic, which means we do not use it that way anymore.Thanks, Barque, but refuge can be used as a verb indeed