1)
What is "Tosach"?
1.
'Rashi': Based on context, it is a weapon. Ibn Ezra - there is nothing like this in Tanach.
2.
Malbim: They are giant slingshot rocks that can destroy fortresses.
2)
What is the noise of a spear?
1.
Ibn Ezra: Normally, one who holds it makes a noise with it 1 .
1
E.g. he bangs it on the ground. (PF)
3)
Why does it laugh at the noise of a spear?
1.
'Rashi': It does not fear it.
