Paula - Barrier

Belch's entire body began to bubble and wriggle, and then those lips stretched into a pointed spout once again, and he hurled some sort of yellow liquid at them!
	“Barrier!” cried Paula, and she spread her arms out wide! Suddenly, a crystalline wall appeared in mid-air, and that horrible muck splattered all over it with a heavy thwack!

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Mother 2, Chapter 5