hi austine,
assume that the trustee is within his rights to seek repayment. Don't read too much into the phrase "fraudlent transfer". There are certainly defenses to an avoidance action by the trustee, but based on bankruptcy law are extremely technical and fact intensive, and difficult for a pro-se litigant to assert.
Hire your own attorney to oppose the debtor's avoidance action.
read section 507(a)(3)(A) at
http://www4.law.cornell.edu/uscode/11/507.html
which grants third priority for wages and salaries, including severance pay, and received within 90 days of the bankruptcy filing. One has to file a proof of claim, which costs nothing at all if you do it yourself. According to section 1129(a)(8)(B), the debtor's plan of reorganization must pay the entire amount of an allowed claim in this class.
best of luck!