"ऐसा लगा मानो बम फटा हो।" Which type of Avyaya (Indeclinable) is used in this sentence?

In the sentence, the word 'मानो' (maano) is used to clarify or manifest the form/appearance of the feeling ("It felt as if..."). Connectives like 'मानो', 'यानी', 'अर्थात' that specify or manifest the nature of the preceding statement come under Swaroopbodhak Samuchayabodhak Avyaya.