Learn Turkish: Fırsatçılar mağazaya girdi, içeride kapışan kapışana. - The opportunists entered the store; inside, people are snatching left and right.

This is the exact pattern your current lesson covers! It uses the subject participle -An twice: first in its plain form (kapışan, the one who snatches), and then with the dative case -(y)a (kapışana, to the one who snatches). Turkish uses this doubled participle pattern to describe a scene of chaotic abundance, intense competition, or frantic activity by a crowd.

What is the base verb of kapışan, and how does the suffix change its meaning?

The root is kapmak, which means to snatch or to grab. The -ış suffix makes the verb reciprocal, meaning an action is done together or to each other. Therefore, kapışmak means to scramble for things competitively or grab at things in a frenzy, which perfectly describes opportunistic shoppers.

Why doesn't the second half of the sentence (içeride kapışan kapışana) have a main verb?

The chaotic abundance pattern ([Verb]-An [Verb]-AnA) frequently acts as the entire predicate of the clause all by itself. It paints a vivid picture of an ongoing scene. You do not need to add a copula (like a "to be" verb) or a word meaning "happening" at the end; the construction inherently implies that this chaotic action is currently taking place.

What is the function of the -çı suffix in fırsatçılar?