What I'm trying to say is that you don't need two rules to handle this: one is enough.  The only difference between the two parses is that one has a Pv link, the other has an Os link, otherwise, they are identical.  For the second rule, you do not even try to verify that Os is the link type, you just ignore the link type completely. 

In other words, if RS is the link, then <F_R ref> contains "injury", in both cases.

In other words, you can completely remove the first rule, and remove <F_R adm_set> = % from the second rule, and it will work as before.