Enemies, and the merchant.
Okay, if you are low on health, and on ammo do not run to the merchant, and hope that he helps you. Because he will not, he will not pull a rocket launcher out of nowhere, and start blasting. As a matter of fact, he won't even talk to you when enemies are nearby, so if you need ammo, or health, you have to kill them some other way.
The reason why the merchant won't sell you anything, is because he is a Ganados, and if the other Ganados saw him talking to you, they'd know he'd betray him, and then they'd kill him, and then you would never get to buy or sell anything ever again.
So do not go to the Merchant when Enemies are following you.
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