Swap positions with an enemy and blow up both spots. It sounds unhinged and it is, but it's also genuinely useful - the explosion at both locations deals damage, the repositioned enemy is now out of formation, and you're suddenly somewhere unexpected.
Strategy
Use it to pull a ranged or shielded enemy into close range while simultaneously escaping your current position. The dual explosion is a nice bonus but the real value is the forced reposition. Against bosses the teleport can break predictable attack patterns.
Strengths
Forces an enemy out of their preferred position
Dual explosion adds burst damage at both swap points
Creates chaos in enemy formations that can benefit the team
Weaknesses
You end up where the enemy was, which may not be safe
Less useful against groups where individual repositioning doesn't matter