What is this form : Verb + はせん?


I am currently trying to read Bleach in Japanese. So far I haven't ran into
any difficulty that a good dictionary cannot overcome. However in this
particular scene I am puzzled by a particular scene, in the first tome,
chapter 5 I think:

> ![enter image description here](https://i.stack.imgur.com/KXWOk.jpg)
>
> 俺のものだ！誰｛だれ｝にも渡｛わた｝しはせん！！まして黒崎｛くろさき｝一議｛いちご｝！！

So, this character is _Orihime_ 's brother. They have lived together until he
died, and they were very exclusive, living without their parents. Upon his
death, _Orihime_ was at first praying for his rest everyday and such, but
after a while she stopped praying and made new friends, including _Kurosaki-
kun_ with whom she is in love. Driven by jealousy, the brother comes back as a
_hollow_ to reclaim her.

So, I understand the rough meaning (I think):

> She is mine! No one will take her from me!! Especially you, Kurosaki-kun!!

So my questions:

  * Is this the correct sense?
  * What is this form ? Is it simply a shortcut for 〜てはいけません? Where does it comes from? Is it common?
  * I have always used 渡す in a literal sense (for a road, a bridge...) Is it common to use it like this?




The basic meaning is the same as 渡さない. There are two differences:

  1. The focus particle は adds emphasis to the negative. In order to add the particle, the verb is split into two parts, 渡し＋しない, with the particle added in between. 

  2. The Western negative form せん (from せぬ) is used instead of the Eastern form しない.

No, it doesn't mean "cross over a road or bridge". He just said 「俺のものだ！」
("It's mine!"), so you can tell he must be talking about not handing something
over to anyone.

By the way, you'll see variations on 連用形＋は＋しない sometimes. One common form
after the high vowels /i/ and /e/ is ～やしない, where the /wa/ has weakened to
/a/, and the transition from the high vowel to /a/ sounds like a /y/ sound. If
the /i/ or /e/ drops out, then it contracts further, as in the idiom
ったらありゃしない, from と言ったら＋あり＋は＋しない.




The basic meaning is the same as 渡さない. There are two differences:

  1. The focus particle は adds emphasis to the negative. In order to add the particle, the verb is split into two parts, 渡し＋しない, with the particle added in between. 

  2. The Western negative form せん (from せぬ) is used instead of the Eastern form しない.

No, it doesn't mean "cross over a road or bridge". He just said 「俺のものだ！」
("It's mine!"), so you can tell he must be talking about not handing something
over to anyone.

By the way, you'll see variations on 連用形＋は＋しない sometimes. One common form
after the high vowels /i/ and /e/ is ～やしない, where the /wa/ has weakened to
/a/, and the transition from the high vowel to /a/ sounds like a /y/ sound. If
the /i/ or /e/ drops out, then it contracts further, as in the idiom
ったらありゃしない, from と言ったら＋あり＋は＋しない.

