Good on them, for 3 reasons.
1 - It increases the likelihood of Ward / Hobbs falling to us at 7(9)
2 - It takes out 1 of their 2nd rounders (and reckon they will be looking at similar players to us
3 - The Giants will be looking to trade that Pick 21 as I don't think they have list spots, and they also don't want it in this area as it risks how high a price they need to pay for Fahey (and diminishes the point of them trading to get 2 picks in the 50's (which should be enough to secure Fahey) - I'd trade Norths 1st next year for it, and then look to trade out 1 of our 26,27 or 28 for the Saints 2nd next year