Paradox is able to heavy melee right before ult to punch the swapped target within certain distance, but is unable to do so when time wall is placed beforehand. Unsure if this combo is intended, but inconsistently works.
Burst triggers with spirit amp and spirit resistance shred so I think it should also work with dmg amp. Also, dmg amp not triggering burst seems to apply to any source of spirit dmg and other character abilities.