If you must you can buy rigging cutters that are powered by .22 blanks. They were panned by Pratical Sailor( as rigging cutters)  but might do for cutting chain.  Fully enclosed so no risks. Available at Landfall Navigation. I orerf the rral sailor's solution of a rope tether and a knife. Chain costs too much to cut. russ Be Holy or Die Trying"  St Stephen 33AD "Be joyful always; Pray constantly; Give thanks in all circumstances, for this is God’s will for you in Christ.....Test everything. Hold on to what is good. 1 Thessalonians 5:16 "Since you cannot do good to all, you are to pay special attention to those who, by the accidents of time, or place, or circumstances, are brought into closer connection with you." St Augustine