Explosions and TNT block and entity

[NiLSPACE]

i already tried to make it ignore both water blocks but it didn't realy work. i tried

if (GetBlock(a_BlockX, a_BlockY, a_BlockZ) != 8,9) //should be E_BLOCK_ETC now 

and

if (GetBlock(a_BlockX, a_BlockY, a_BlockZ) != 8||9)  //should be E_BLOCK_ETC now 

that was what i found on google
for the obsydian and bedrock stuff. i don't think the explosion will be IN a obsydian/bedrock block