SMB3 - Boomerang Bros in an airship

FunkyKong84

Blooper
I was just playing SMB3 (world 3) and right after I beat the first castle the hammer bros roaming in the map suddenly transformed into an airship which is full of coins and in the end you have to fight two boomerang bros. How did this happen?
 

FunkyKong84

Blooper
thnx
 
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