Jamieson, Fausset and Brown on Micah 7:4

4. as a brier--or thorn; pricking with injury all who come in contact with them (2Sa 23:6, 7; Is 55:13; Eze 2:6).

the day of thy watchmen--the day foretold by thy (true) prophets, as the time of "thy visitation" in wrath [Grotius]. Or, "the day of thy false prophets being punished"; they are specially threatened as being not only blind themselves, but leading others blindfold [Calvin].

now--at the time foretold, "at that time"; the prophet transporting himself into it.

perplexity--(Is 22:5). They shall not know whither to turn.