When the principal tries to comfort Lindsey and is failing miserably what does Susie wish he would do

And what is music then? Then music is
Even as the flourish when true subjects bow
To a new-crowned monarch.
I stand for sacrifice; The rest aloof are the Dardanian wives,
With bleared visages come forth to view
The issue of th'exploit. Go, Hercules.
Live thou, I live.

-Portia

it is pretty much saying that Portia, giving a speech to Bassanio before he chooses his casket. She gives him music in order to suggest that her rhymes are hinting at the lead casket.
I am here to be sacrificed- she as an individual is destroyed to save her father's estate. Here future is a function of the value of the estate. It remains to be seen whether is willing to be sacrificed or not.
She compares Bassanio to Hercules- who will save her. This is a complimetn however she references him as a fortune hunter by mentioning this. By saving Troy, Hercules got not the maiden but the horses of her father.