I got laid off and offered severance.. meanwhile discussing other internal roles

I got laid off and my last day is this Friday. They gave severance letter and said they'll pay bi-weekly like how I was originally paid so far as an employee.

Question is that I am discussing other internal roles with another department currently. There is a high chance that I will get this job. It looks like it'll take at least another 1-2 weeks that I will get the offer and finalize it. The severance letter stated that if I get employed by this company again during the severance pay period, severance will stop.

In this case, should I just sign the document ASAP so I get the severance for the days in between my termination date and when I am hired by them again? Or should I wait few more days to see what my other internal role's process is?

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