please do not think because one bird lost a nest box , it is doomed. this happened to Miss Edmonton twice. She went away and licked her wounds and healed and 2 years later, had her own site. Now if this  was Princess, I realize sh e is older but also wise enough  to know to leave and heal.
years ago in San Jose, Fernando came along and beat out older male. that male was spotted a few weeks later not far from campus  and he stayed there , out of harms way. He also went back to same spot the next year , out o f harms way. He seemed to know his time was up. He was now into retirement.
we had a male DO1 a t WEber, that we watched from  ground. He lost Weber site, but last year we found him at misercordia. He was n o spring chicken.
you do not know for sure who it was, but regardless, I saw 4 really bad fights in Edmonton last year. some appear worse than they are as  they  are on backs a lot with talons locked. WE have seen a few on cams , where people thought there must be one injured or deceased and two of these have turned up at other sites. 
So the saying  , no news i s good news is just that.  
when viewing a cam, turn off sound when viewing a fight. Sound makes it  sound worse than it is. 
talons crossed.