Ooc Shepard would have offered weapons, and armor. For the people who wanted to use one of her weapons she would have given a quick tutorial on how to use them, and how to get in and out of the armor as quick as possible without the removal tools on the ship. Though she would also offer use of easy on and off on the Normandy.
Sarah Sully would have been there with little Harri. She would offer to put protective runes, and other protective spells over all the safe houses, And likely would stay in one. At least so Thomas can keep sane.
Bucky would have stayed home, with the kids, in case Peggy wanted to go.
Sophia would have said that she would join anyone working at the Hospital, to help, and to offer defensive measures for anyone coming in.
Stevie would have come to represent he and Mary Ellen. He would have offered their baby sitting services. And if things get really bad he'd join in the fray, but he'd feel better about protecting the safe houses.