ok so @magsbanes post about jocelynĀ got me thinking (spoilers under the cut)
what if that wasnāt actually jocelyn who got killed? we know valentine has been experimenting with dark shit for years. what if he found out a way to glamour a body to look like someone else, without it looking like a glamour (so the other shadowhunters canāt detect it). this is assuming that regular glamours disappear when a person dies, but maybe they donāt?
so either he just regularly glamoured jocelyn, or itās some ~special glamour~. point is: the dead body is not actually jocelyn.
instead, valentine has found a way to smuggle her out of the institute, and now sheās being held captive. (thereās a whole discussion to be had here about the absolute fucking horror of her being back with her abuser, but thatās for another time)
now, we know that as of 2x06, luke is still missing since the demon attack (x). what if he saw jocelyn be taken and is out looking for her? alternatively, heās also been captured by valentine, which could open up a whole new insight into valentine and lukeās ex-parabatai bond. this might even make more sense, because i doubt luke would just bolt and leave clary thinking her mother is dead. itās still possible that he did leave voluntarily, though, because as he said, "when valentine took you, i promised myself it was the last time iād ever be without youā. i doubt there was much time to think it through and luke loves jocelyn so muchĀ so maybe itās not that unlikely that he just threw himself into the chase headfirst.
basically, i think thereās a reason we never got to see luke finding out about jocelyn. knowing luke and how attached he is to jocelyn, i think he would be the first person there. i also think thereās a reason we got the first jocelyn kiss in the same episode jocelyn isĀ ākilledā. either thatās because they wanted her death to hurt more, in which case itās shitty writing because thereās nothing admirable about killing an abuse survivor after sheās finally found reconciliation in another love. orĀ itās a ploy to throw us off, to get us thinking that itās just done for shock value, when in reality theyāre setting up for more depth to valentineās cruelty, as well as luke and jocelynās love for each other.