Jehanne will take seriously his responsibility to protect Fiona: he won't run out to the giants, but will certainly engage any who come their way (trying to avoid the oil on the ground).
Defense roll: 9 + stress die 0 (uh oh), but no botch unless there are more than three botch dice = 9
Attack roll (if necessary): 11 + stress die 5 = 16
Falko remains as rear guard for the moment, looking back up the stairs, but he hears the sounds of Marcus's handiwork and sings: "Oh, no, fire's on the go, missing the show!"
Defense roll (if necessary): 12 + stress die 6 = 18
Attack roll (if necessary): 12 + stress die 9 = 21
((I don't think any of these combat stats are modified due to their being giant-sized....))