Responding to specifically to Calemyr and tactical thinking.
Spoiler: V5C11
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If you wanted to do a specific ambush with team Raven + Team CME then this would how you would do it.

1) We know that Salem and the White Fang were already setting up explosives all around Haven Academy.

2) As part of the plan, Leo should walk Ruby and company into a building surrounded by explosives, then lock the door behind him.

3) Raven then opens up a portal for her and Leo.

4) Portal closes, the bomb goes off, everyone of Ruby and company dies.

5) Successful Ambush.

Brought to you by the power of Raven's semblance.