My plan so far is to put 3 merits into Assassin's Charge, and 3 merits into Feint. If they can be taken higher than 3 i'll probably put 4 merits into AC and 2 meris into Feint. I think Feint would be quite useful in soloing situations, especially when THF's C marksmanship is hindering your ability to land the various types of status/drain bolts.