1)
What is the meaning of "Heri'u"?
1.
Targum Yonasan: They blew Teru'ah.
2)
What is "va'Yimasu"?
1.
Radak: It is Nif'al (they melted), like "va'Yimas Lev ha'Am" (Yehoshua 7:5).
3)
What are "Asurav"?
1.
Rashi: They are the ropes that bound him.