Multiple Lightnigs summon multiple Pigmans

If multiple Lightning Bolts hit one pig the pig turns into multiple Zombie Pigmans

Steps to Reproduce
1. Place two command blocks (or more) with summon LightningBolt at a certain coordinate
2. Place ONE pig at the coordinate
3. Power the command blocks at the same time
4. The pig turns into the number of lightnings Zombie Pigmans