Indeed, the outro. As well as Bleak's riff, Atonoment, the intro of Beneath the mire, Hex Omega, yeah apparently mike has some arabic influences but I don't think he listens to arabic music.
I've learned rhythms in belly dance class that I recognize in Opeth's music. For example, I hear the Saidi (from Egypt) "dom-tak, dom-dom tak" rhythm in Bleak.
Well,as in the link you provided,he has a hybrid descent coming from both Arabic and Kurdish backgrounds like many people in Southeast Turkey but he is generally known as a Turk/Kurdi in Turkey.Few would know his Arabic background.Kurdish people are more common in Southeast Turkey than Arabic descents. The music he makes is categorized as "arabesque".I don't know if this style is known worldwide but to those who are not familiar with,it has a great Arabic music influence both in melodies and singing-wise,plus it is generally a sorrowful music.Akerfeldt himself declared in 2008 İstanbul concert that he wrote the intro of Bleak after he had listened to Tatlıses.We were surprised,too.