Lightning Network security

Lightning Network securityHi there! I've got one little question. What if: a) Alice (A) and Bob (B) will open a LN-channel with 5 BTC both; b) A then sends 1 BTC to B (signs and sends to B a transaction that 4 BTC goes to her wallet and 6 to B's); c) B sends 2 BTC to A (sings and sends to A opposite transaction: 4 BTC to his and 6 to A's); d) B signs and broadcasts the b transaction (4 BTC goes to her wallet and 6 to B's); Is the Lightning Network secure enought to avoid this scenario? via /r/Bitcoin https://ift.tt/2J2cmn1

Hi there! I've got one little question. What if: a) Alice (A) and Bob (B) will open a LN-channel with 5 BTC both; b) A then sends 1 BTC to B (signs and sends to B a transaction that 4 BTC goes to her wallet and 6 to B's); c) B sends 2 BTC to A (sings and sends to A opposite transaction: 4 BTC to his and 6 to A's); d) B signs and broadcasts the b transaction (4 BTC goes to her wallet and 6 to B's); Is the Lightning Network secure enought to avoid this scenario?

Hi there! I've got one little question. What if: a) Alice (A) and Bob (B) will open a LN-channel with 5 BTC both; b) A then sends 1 BTC to B (signs and sends to B a transaction that 4 BTC goes to her wallet and 6 to B's); c) B sends 2 BTC to A (sings and sends to A opposite transaction: 4 BTC to his and 6 to A's); d) B signs and broadcasts the b transaction (4 BTC goes to her wallet and 6 to B's); Is the Lightning Network secure enought to avoid this scenario?