summon and charm are different and used/counted separately.
my wayfarer summoned and charmed at the same time frequently.
as for charming more than one; well, charming skills have long cooldown time, without using special arrows, there's no chance for one character to charm two enemies, since the first charmed will either be dead or woken up before the charm skill is activated again.
I save all the special arrows for special fights, but just end up never using any of them~~
