that's actually why I hold a wad of STEEM and SBD, to take advantage of shorter term moves like that through the internal market, especially when the spreads would widen dramatically.
unfortunately, I've been so busy lately it's been a while since I've had a chance to take advantage of it ... lol
Regardless, it is smart that you have enough liquid to take advantage of it from time to time. I'm working toward getting more liquid myself for that reason among others.