Remus Lupin

Right.

I know we're all shocked, and sad, and horrified, and afraid.

But for those of you who are not fugitives already:

Maintain your cover. Keep to your routines. Trust in your occlumency. The Order cannot function as an entirely underground organisation. Neville did this to protect us; trust in his gift and his sacrifice. 

When Filius Flitwick set up the false Hogwarts book, the one that allowed us to conceal the births of muggleborn infants, Savitha Desai caught him on his way back out. They duelled, and she hit him with the entrail-expelling curse. I think Flitwick probably failed deliberately to parry what he knew would be a fatal curse, to avoid being taken alive and questioned.

Minerva, Poppy, and Pomona could not for even an instant reveal their grief and horror. Especially Minerva, who wore the Dark Mark. Minerva had to smile at Desai, praise her skill, step over the blood of her murdered friend, and go about her day.

Those of us in the Order at the time honored Filius's sacrifice and carried on the work he'd died to make possible.

You can all do the same.