A little question about polite Japanese


I can't understand why is it used polite form in -「いらっしゃい。逃げ切れるとは思わないで」, I
would translate it like this - "Come! Don't think you can run away!". And as
far as I can guess シオン is telling it to an enemy?

[code]

    カイム：「よし、これでこっちの動きは封じた！」 
    シオン：「やるわねカイム！さすがあたしの弟！」
    カノス：「ちっ、先を越されちまったか！今度はこっちの番だ、頼むぜシオン」 
    シオン：「いらっしゃい。逃げ切れるとは思わないで」 
    シオン：「Casting some 厨二 spell」 
    カノス：「はははははっ！派手にやってくれるぜ！！」
    
[/code]




Simply because シオン and カノス knows each other, and シオン is showing some respect
for her enemy, カノス, I guess?

**EDIT:**

(forget my previous answer.)

So カイム, シオン and カノス are friends, and they're trying to disturb and run away
from someone not specified here?

Under this context, by "いらっしゃい", シオン is not requesting anything. This does not
mean "Come, please," nor "Come on."

Japanese いらっしゃい (or more politely, いらっしゃいませ) can mean "please come," but it
usually means "Welcome" or "Glad to see you" or even "Hello (in stores,
etc.)". シオン is showing her appreciation for カノス's joining the battle.




Simply because シオン and カノス knows each other, and シオン is showing some respect
for her enemy, カノス, I guess?

**EDIT:**

(forget my previous answer.)

So カイム, シオン and カノス are friends, and they're trying to disturb and run away
from someone not specified here?

Under this context, by "いらっしゃい", シオン is not requesting anything. This does not
mean "Come, please," nor "Come on."

Japanese いらっしゃい (or more politely, いらっしゃいませ) can mean "please come," but it
usually means "Welcome" or "Glad to see you" or even "Hello (in stores,
etc.)". シオン is showing her appreciation for カノス's joining the battle.

