Urates can be yellow. Unless the consistency is loose like poop, probably what it is.
Just in case, try and provide your snake with more water since it can be indicative of kidney issues at times. Also, if it doesn't normalize by next poop/pee, please take him to see a vet. You got him at a big box store, which increases the chance of parasites.
Onto the other issue...
Young BPs are notoriously skittish and capable of associating a human with stress. I'd advise it's best to let him cool off for a week. Just toss a towel over the 20G and pretend he doesn't exist other than monitoring his temps/humidity. Let him have some "me" time.
During that time, doublecheck all your husbandry. Does the animal have two hides? Temps right? Humidity right? Are there other cover options in the enclosure, such as deeper substrate, plants, cardboard or pvc tubing? Reactions like this are often caused by off husbandry and thus stress, especially in young BPs. Make sure all of that is in order while letting the little guy have a cooldown.
Once the week's up, heat up the food in his room. Remove the towel. Offer.
If he takes it, put the towel back on, wait for the next week.
Let him get two solid feeds in before handling or bugging him.
Edit: And as mentioned, the prey might be too small. Try bumping it to about 10% of body mass. Little guy might just be ravenous which is why he's striking at anything warm he sees.
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