5 That sight thereof bred cold congealed fear:

That > [So that] congealed > frozen

6 Which to increase, and all at once to kill,

at once > at one time; hence: at a stroke

7 A cloud of smothering smoke and sulphur sere

sere > yellow; or perhaps: searing

8 Out of his stinking gorge forth steamed still,

gorge > throat; maw still > continually

9 That all the air about with smoke and stench did fill.

111.14