0.25% of this trade fee goes to the Liquidity Providers who provide liquidity for that pool. It is added to the pool balance.
If previously there were 100 SLP tokens representing 100 EXP and 100 LAB each token would be worth 1 EXP & 1 LAB.
If one user trade 10 EXP for 10 LAV, and another traded 10 LAB for 10 EXP, then there would now be 100.025 EXP and 100.025 LAB.
This means each LP token would be worth 1.00025 EXP and 1.00025 LAB now when it is withdrawn.