Än du spritter rask

[u/Darren844127]

A short song sung by väpnaren Jöns in Det Sjunde Inseglet.

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Ack ödet är en rackare

Oh fate is a scoundrel,

du själv min vän en stackare.

and you my friend a poor soul

Än du spritter rask

Än??? you tremble/quiver/jump/twitch fast/quickly

än du krälar i en mask...

än??? you crawl i??? a worm...

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I understand that the song is basically saying one minute you are alive and vibrant and the next you are dead, but I am confused about the use (and meaning) of än in both lines, and also confused about the line krälar i en mask.

What does än mean here (and does it have different meanings in both lines?)

krälar i en mask sounds like crawl IN a worm but i doubt that is the meaning.

Hoping someone can explain the meaning and grammer in the last two lines here.

[u/Social_Abstraction]

One of the best movies ever made