2 lessons learned; stick to your feeding schedule AND being large means nothing...

[cichlid savage]

i also feed my fish on a very odd schedule and it hasnt effected them in the way you described...but a week ago i got out of the shower in the morning and my new 4" silver arowana was in my 10" longnose gars' teeth...i must have caught him just in time cause i banged on the tank lid and he let go, the arowana ended up just fine.

The problem with your situation is having a 4" fish in a tank with a 10" fish. That gar was hearing the dinner bell from the start.

 

[isa.alhadad]

It could be the feeding schedule. I starved my 10-11"silver aro for 2 days to try get him on pellets. Yesterday, he ate my 5" g. snakehead.

However, if it's only been half an hour, I'm not too sure.