Assertion: trombone's slide | /r/HasProperty | located behind the sight line of the player
Facets:
Source sentences:
text: Because the slide is located behind the sight line of the player, it is good practice to do a visual check behind you before lifting the trombone to play and glance occasionally over the shoulder to be sure nothing has come into possible collision distance without your knowledge.
text: Because the slide is located behind the sight line of the player, the trombonist should always check behind them before lifting the trombone to play.