In Agents of SHIELD season 2, both HYDRA and SHIELD are after the original 0-8-4 known as the obelisk/diviner.
Throughout the season, we see that anyone who comes in contact of this Kree device turn to stone instantly.
However, when Isabella Hartley touches the obelisk, she doesn't instantly turn to stone. Instead, her hand and arm slowly turn to stone. Later Hunter saves her by cutting her arm off.
So, my question is, why did Isabella Hartley not turn to stone instantly?