1)
What is the meaning of "v'Chutesu"?
1.
'Rashi': This is like "va'Yaksum" (Bamidbar 14:45, i.e. they struck them).
2.
Malbim: Nations were at war with each other.
2)
Why does it say "Elokim Hamamam b'Chol Tzarah"?
1.
Malbim: It was clear from (a) the many afflictions, (b) the diverse kinds of afflictions, and (c) since it spread through all lands, that this was not nature; it was a Divine punishment.
