[quote=@Ploxerdon]
<Snipped quote by Flamelord>

Theres also the thing where she is trying to bait the rest into thinking she is weak.
This might catch others off guard.
And she was also caught by suprise, and she doesn't know who is behind her so yeah... 
[/quote]

E rank strength is approximately 10 times the average human. No one is going to bat an eye if she manages to kill a Master without being seriously injured by a bullet. 

Really, your solution solved nothing at all, if only by the fact that he coincidentally chose your own servant as his hostage, ensuring that he would actually survive such an attempt in the first place.