User blog comment:TyrantRex/Proxy Fighting Results./@comment-5463244-20140119230917/@comment-11454852-20140119232224

Well, I find that if you already have a lot of gauge (5+) you can afford not charging for one turn, also if you only have 1-2 cards in hand both are/its useful, you might not want to charge it since a less helpful card might appear.