Yes (that example sounds to us like something that really would cause panic amongst the ranks!).
Source: Warhammer: The Old World Online Rules Index
The Psychology of War - Frequently Asked QuestionsURL Copied!
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Are units required to make Panic tests due to the actions of friendly models? For example, if a Wizard miscasts and rolls a 2-4 on the Miscast table, causing a Dimensional Cascade and inflicting sufficient casualties on a friendly unit to cause it to Panic, must that unit make a Panic test?URL Copied!
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Source: Official Warhammer: The Old World FAQ & Errata - Version 1.2
Units must make a Panic test when a nearby friendly unit with a Unit Strength of 5 or more is destroyed. When is Unit Strength counted – from the start of the turn, the start of the phase, or the point at which the unit is destroyed?URL Copied!
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From the start of the phase during which the unit was destroyed. For example, if a friendly unit with a Unit Strength of 10 is destroyed by enemy shooting during a single Shooting phase, it causes panic in nearby friendly units. Players are not expected to remember the Unit Strength of every unit from turn to turn or phase to phase, but should keep track of Unit Strength during each phase.
Source: Official Warhammer: The Old World FAQ & Errata - Version 1.2