Its a very good question. Its possible that they will add a way to disengage from mob...or it might just end very similar to trifurcate mechanics-wise...like using a certain amount of TP to nock an arrow so if you have X TP you nock one, if you have 2X TP you nock 2 arrows...

But i'd say auto-attack might stop when you remove lock from a target...would be a very simple way to allow ppl using stuff like multishot properly, also helping with hate control since archer might have to manually control its hate after changes or they will die alot until we have the first adjustments (assumining it will shot at same speed it does now) ^^: