If I was with anyone I cared about, I'd run and hide. Getting them out safe is the most important thing.
Otherwise, I'd like to think I'd see if there's a couple of others than are up for rushing them, obviously more likely with knives than guns. Or at the very least chucking some chairs at them. But in reality I'd probably either freeze or run anyway.
Maybe, but my guess is a university. So diverse, so many backpacks and rucksacks donned day to day anyway and so many thousands of students in and out, constantly moving.
I think in some locations in life (train, shopping mall) you can look out perhaps for a suspicious, bearded, Islamic looking (if there is such a thing) person with a backpack.
Hardly going to stand out at a university though are they.
The more they blend in the easier it may prove to be for them.
You don't really get anywhere students congregate though, limits potential casualties. They tend to go for large crowds for the bombs. The new nutter with a van act is a bit more random but they still love the symbolism: Twin Towers, Westminster, London Bridge. Even Arianna Grande you could argue because of her "decadent Western ways". The ones that don't fit are the tube bombs, but that could just be logistically it causes maximum damage.
If it was me I'd just be lobbing grenades into Tescos in Chipping Norton or something, the more seemingly random the better. But this bunch of idiots want to be movie villians, look at the fucking videos they release. I expect the next attack, should it happen, will be another symbolic target.