Yes, anticoagulent. A lot of predators have that - means wounded prey keeps bleeding, so can be picked off at leisure later if not killed at first.
Tools: carry long nose forceps, or better still long nose pliers which will give you more grip with bigger hooks or if using trebles. Use barbless/crushed barbed hooks too, to make it even easier. The other essential "tool" is a glove - I use one of those red rubber coated gardening/industrial type gloves, on my left hand (being right handed), also ideally an un-hooking mat, which should be wetted before lying the pike on it. Failing that, use the wet net, soft wet grass etc.
Method (for right handers): If lip hooked, just flip hook out with forceps/pliers. If more deeply hooked, lie pike on side or back, head pointing to your left. Or alternatively lie pike longways and "straddle" it. Allow time for it to calm down if its still lively, insert gloved left finger gently under pike's left gill cover up under chin and lift its head/mouth up towards you. By gently pulling its lower jaw towards you you'll find its mouth will then open naturally allowing easy unhooking access. If it does flap, don't panic and pull your hand away, stay calm and it will calm down. Despite looking scary, pike are actually quite fragile so need careful handling. Allow it time to recover in the water to check its strong enough before releasing.
Congrats on your first capture, river pike are lovely specimens