from this page http://irowiki.org/wiki/Lava_Slide line 9 of the Note it says:
- If a target is in the area of effect of multiple Lava Slides, the Lava Slide with the lowest ID number has priority. Even if the highest priority Lava Slide misses, the target is nonetheless granted the two-second immunity and cannot be hit by any other Lava Slides during this time.
Is there a way to know if you have the lowest ID number?