about the output file, which file does it come from?

[Davidseye]

I use survivor(1.0.7) to merge 2 vcf files, one of it is tumor vcf and another is matched normal vcf .I use the command:
survivor merge NandT.list 50 2 1 0 0 50 output.file . But when I check the output.file ,I find it all come from the normal vcf, but in my thought I think survivor will output 2 sv ,one in the tumor and another in the normal if they match the standard I set . I change the command : ls tumor.vcf normal.vcf > TandN.list ,and it still the same-- all come from the normal. I want the sv in output.file all come from the tumor or both ,how can I do?
thanks!