 वायुरप्यत्र नाज्ञातश्चरेदिति मतिर्मम।न ह्य स्त्यविदितं किञ्चिद्राक्षसानां बलीयसाम्।। 
 I think even the wind who has no form cannot move here without being detected. Nothing escapes the notice of powerful demons. There is nothing unknown to them. 