And as the sky's falling down it crashed into this lonely town Hello, this is from a song titled I See Fire, by Ed Sheeran (https://genius.com/Ed-sheeran-i-see-fire-lyrics). It's about a dragon. [Bridge] And if the night is burning, I will cover my eyes For if the dark returns then my brothers will die And as the sky's falling down it crashed into this lonely town And with that shadow upon the ground I hear my people screaming out Could you explain to me the third line, please? "And as the sky's falling down it crashed into this lonely town", what does the "as" means here, "while" or "because"? Why does he use the present continuous in the first clause ("as the sky's falling down") and the past simple in the second ("it crashed into this lonely town")? Thank you.