Need help desperately

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I'm so very sorry to hear about your friend passing away. And don't you worry, with a little TLC this Phal will continue to grow and bloom.
It looks like an old plant that has been with your friend for a long time. Don't be terrified of what could happen to it, rather enjoy it as he did. I'm sure your friend didn't want this plant to cause you worry but rather that it would comfort you and bring you joy.
Besides it looks like a real fighter if it has survived this far in a big pot like that and normal soil! I'm sure it will be with you for a very long time!