Allg mate I hope you had a great time with the missus .
Wouldn't that be 4 shards because she gets +10 to Telepathy powers from Discipline Focus (Telepathy) ?No, because that would give Overbleed 25, not enough for 3 extra shards.
She'll put the first one on Shriek (16 damage) and the second two on fat man (14 then 11 damage).
For iterations/ease sake, Soul Killer is Explosive damage and is targeted to the Head and Body.