Grace, what do you know about… Wait, she grew up with three trained assassins. She’s probably heard a few things in regards to martial arts. Self-nitpickery withdrawn.
Grace’s objection to Sarah wanting to date Elliot is never made terribly clear, but it probably had something to do with their earlier interactions not being the best up to this point, so go with that.
How she’s also THIS insightful about this particular situation is also something of a mystery, but she does that sometimes.
Comic commentary added August 28, 2014