OOC Discussion:
Sif's going to take a very nasty hit from a Praetorian at some point today. Right to the shoulder. She'll heal from it just fine, but she's honestly not expecting these things to be able to pierce her armor and whoops. It'll be right around the time of setting up/off the bomb. It won't knock her out of the fight completely, i.e. she'll still be able to make the run back to the TARDIS, and she's going to kill the thing very angrily, but it'll be the first serious wound she's taken in a long time and she'll be very fussy about how she's fine.