Decoding the pattern:
To decode the pattern used in the transformation of the word ROSE to TQUG, we need to analyze the positional shift of each letter.

Positional shift:
- R is shifted forward by 1 position to become T
- O is shifted forward by 2 positions to become Q
- S is shifted forward by 3 positions to become U
- E is shifted forward by 4 positions to become G

Applying the pattern to BISCUIT:
To apply the same pattern to the word BISCUIT, we need to shift each letter in the word by the respective positions as determined in the pattern for ROSE.

Positional shift for BISCUIT:
- B should be shifted forward by 1 position
- I should be shifted forward by 2 positions
- S should be shifted forward by 3 positions
- C should be shifted forward by 4 positions
- U should be shifted forward by 5 positions
- I should be shifted forward by 6 positions
- T should be shifted forward by 7 positions

Encoded form of BISCUIT:
Therefore, applying the positional shifts to each letter in BISCUIT, we get the encoded form as CJXHZPA.