Bukkit

What steps will reproduce the problem?
1.I use worldguard and i set that a player is invincible and that theres no-pvp [on spawn]
2.I use a exploading weapon and it deal damage
3. its wierd, but a flash takes damage... dont know why

What was supposed to happen?
It shoudn't take damage![flash also!]

What version of CrackShot are you using?
CrackShot v0.97.16

What version of CraftBukkit/Spigot are you using?
Spigot: 1.7.9, WorldGuard 6.1 [http://dev.bukkit.org/bukkit-plugins/worldguard/files/46-world-guard-6-1/]
Were there any errors in the console? If so, what were they?
No, there arent
Please provide your configuration file if necessary.
The Flash:
Flashbang:
    Item_Information:
        Item_Name: "&9&l[the name]"
        Item_Type: 263~1
        Item_Lore: "&8[some text]"
        Sounds_Acquired: BAT_TAKEOFF-1-1-0
        Remove_Unused_Tag: true
        Skip_Name_Check: true
    Shooting:
        Right_Click_To_Shoot: true
        Cancel_Right_Click_Interactions: true
        Delay_Between_Shots: 10
        Projectile_Amount: 1
        Projectile_Type: grenade
        Projectile_Subtype: 263~1
        Projectile_Speed: 10
        Sounds_Shoot: SHOOT_ARROW-2-0-0
    Explosions:
        Enable: true
        Explosion_No_Grief: true
        Explosion_No_Damage: true
        Explosion_Radius: 6
        Explosion_Potion_Effect: BLINDNESS-120-1,SLOW-120-1
        Explosion_Delay: 20
        Sounds_Victim: LEVEL_UP-1-0-0
        Sounds_Explode: ANVIL_LAND-2-1-0
    Extras:
        One_Time_Use: true